Snetterton was a great circuit for all levels IMO - loads of run off so no danger of damage unless you are way beyond your level of ability
Cadwell looks great - as you say, will reserve judgement til after sunday
Rockingham .... mmm looks a nice twisty circuit with a good mixture of corners. Hopefully this will still be part of Time Attack 2007 (there are a few of us that will be entering this

)
Donny .. the noise check might rule most out unfortunately
Honington - superb.... wasnt planning on running there but couldnt resist it after a few pax laps with Stu. Jim C frequents here and I am sure we could get another day running there without too much difficulty either as a dedicated BigPower day or jointly with others.
Brands Hatch - have done close to 100 laps there myself and love it but as you say it can be expensive.
Spa - will try and tie this into a Ring Trip as there are so close it would be rude not
Oulton - nice circuit, I remember going there when I was about 6 or 7 years old (a hell of a long time ago) and was good to watch.