Tamiya TRF511 myself, Few run TRF502X's, Cat's,Rangos,Kyoshos But the best 'bang for bucks' has to be the second hand Associated B44 or 44.1 round the £100-150 mark for a really tidy example and normall come with a few spares/wheels/tyres. Posibly the Cat SX2 aswell as the new one just came out there may be a bargin to be had. Real easy to set up and loads of people with spares
If your going for new chassis then u got no end of choices but ask at the local clubs theres always somone willing to help with advice.
For BRCA homologation lists check this link below and items on this list dont always mean big money :-
http://www.brca.org/?q=content/homol...-updates/14218