Our DD is in reception at South Lee (they call it Kindergarten) having started there in the nursery 2 days a week from Sept 06.
We chose this school up against Culford (expensive), Barnardiston (quite expensive, run on military lines - would have been first choice for us with a boy) and Fairstead (Newmarket).
The latter was good value and a lovely school for small ones but South Lee won out because of fantastic sports facilities, the fact that they have pony riding teams and most importantly we were very impressed by Mr Whipp the headmaster. We know lots of children who have jumped ship to go there in pre-prep because of the excellent record in both academic subjects and sports. Kindergarten is now full (2 classes of 18 with 2 teachers in each) with a waiting list although we get a booklet with names and addresses of all pupils and some of the older classes are undersubscribed.
You can stay until 13 although we may move DD on at 11 so she gets settled in her secondary school. Culford does have the advantage that they take you right through and there is no doubt that it is an excellent school within lovely grounds - South Lee wouldn't win any prizes for its appearance).
All the children love their teachers and she is getting on really well with her reading etc. Pastorally they are excellent.
We have friends who send their children to St Edmunds and St Louis. We know that St Louis caters for children from about 9-13 and has a great reputation. They are Catholic but say that you don't need to be to attend. They could easily afford private but prefer St Louis which says a lot.
If you need more just let me know as I can ramble on for hours!
P.S. Welcome to Bury St Edmunds area - it is still a lovely old fashioned market city (with great markets twice a week) and has loads of new amenties such as the new cinema complex and of course they are build a shopping centre on the site of the old cattle market.