I don't know the exact European school enrolment timetable, sounds like you'd find it quicker than me! I do know they find out which school around May time, as I know 2 children who found out this year in May 2013. But European school only has 1 year or maternelle - the cut-off dates is different to Belgian schools, I think the rule is you have to be 4 before September, someone will hopefull come along and clarify the exact cut-off and arrangements of maternelle at European school. In any case, with a 2 year old, European school won't be an option this school year. The number of maternelle places at European school is much less than primary places. Local schools are full of children at maternelle level who move on to European school. There is a sizeable proportion of children eligible for European school whose parents chose to keep their children in local schools in primaire level, especially if they are a minority language and the only section for their language is on the other side of Brussels an hour away by school bus - yes just imagine, children on school bus for 10 hours a week minimum, for children at European School Uccle, the school bus leaves at 6.45am from near our house for example, it's 75 minutes! If you choose to live near right Laeken school, then you're looking at perhaps a minimum 45 minutes commute to work at EU, if you choose to live out east in Stockel for example, you're looking at 20 minutes on metro to EU, but 1 hour minimum on the school bus to Laeken. You could live in between Laeken and EU area, ok so you'll be living in the most deprived area of Brussels!!!! So you can understand why many parents who could send their children to EU schools choose to keep them local, for purely logistical reasons.
Enrolments for local schools commence at some of them in September and are as a general rule finished by April the next year, some communal schools don't do enrolments till June, usually the ones which wouldn't be first choice though. But your almost 2 year old could start school in March 2013, the "acceuil" class usually accepts children all year long, once they turn 2 1/2, it depends on individual school. I know our children's school has filled slots for acceuil, starting at various times between September 2012 and latest starters will be May 2012. I do however know a couple of schools in the area of those houses in WSP which will still have places to start in March 2013. Many children do just "acceuil" class in one school, then change school the following September for M1 class onwards - acceuil places are less plentiful than M1, M2 and M3, so they go to whatever school had acceuil places, then swap.
Whilst waiting for a school place, WSP has 2 drop-in nurseries which are mornngs only and very very cheap, plus a drop-in mums and tots where parent stays. Plenty of SAHMs in the area, very multi-national and the dominant languages are English (many 2nd language of many nationalities), German and Spanish and things to to with pre-schoolers in all 3 languages. And for those English children aged 2 1/2 upwards in French or Dutch schools, plenty of after school activities in English.
3090 is Overijse - oh please don't live there, no public transport at all for EU area. It's the worst place for public transport, you'll need 2 cars. You don't need a car at all in WSP. Very limited things to do if you're a SAHM, whereas in WSP you are spoiled.
3080 is Tervuren, the central area of the town is connected by 44 tram to Montgomery and then metro to EU area. It's about 20 mins extra commute time from housing along the tram line. It's heavily English speaking dominated, not so multi-national, most children who are not Belgian go to German school, one of 3 British/English schools, few English children go to local Dutch schools, but if you want Dutch, this is one area I would recommend.
Another Dutch area which is commutable to the EU area is Hoeilaart, post code 1560 which has 2 trains an hour I think direct to Schuman staion under the Berlaymont, train takes 30 minutes. I think it's too far though and life for a SAHM out there is going to be very limiting.
For French, look at 1200 WSL, 1160 Auderghem, 1170 Watermael-Boitsfort, 1150 WSP, plus 2 places in Vlaams Brabant which are 80% French speaking with special status, 1950 Kraainem and 1970 Wezembeek-Oppem. You will find some parts of these latter 2 communes are actually in Stockel area and near to Stockel metro, or are on 39 tram route. You'd get a few more houses in budget in that area very near public transport. Don't even think about driving to work, take the metro or tram.
Here is a house way under budget. I am sure it's one we tried to rent last year but were beaten to it, it's quite compact but more than big enough for 3 or 4 even. It has a BIG garden, it's 5 minutes walk to Stockel metro, is has 3 excellent local schools nearby. IF it really is the house, the landlord is actually nice - he trusted his ex-tenant to arrange viewings and control looking for a new tenant, very few landlords have that sort of good relationship. If I was looking to save money, have a house in a fantastic area, have a big garden, I'd go for this one.
www.immoweb.be/fr/Rent.estate.cfm?idbien=3775805&ongletactif=2&jpgnameinp=3775805_3.jpg&xincludedetail=2&xgallery=gallery&mycurrent_section=Rent&xbg=N#onglet
BTW, just looked and quite a few houses under budget in 1950 and 1970.