Rather than cloggin up the other thread I thought I'd put this here:
Provision here in Northants is really good - if you haven't already registered with these people then its worth doing - they hold a days seminar for Y5 parents thats very informative.
If your DS is statemented then you can choose any school you like and unless there was a very good reason why they could not be educated there then you get in. Although if they could be educated at a nearer school then you wouldn't get funded transport.
If you're not bothered about him going to your local school then the DSP here and www.thedustonschool.northants.sch.uk/here are excellent.
Not sure who / what support you're getting but we got lots of info / support / advice from the ASD team and autism concern who you've probably heard of.