So, what's your favourite Ridge Racer? I'd have to go for Type-4. It was the biggest improvement the series has seen, and is quite a quality arcade racing experience, with plenty thrown in to add to the longevity. Excellent graphics - great music. The definitive RR experience.
Ridge Racer 64 comes a close second, as it's just jam packed with tracks and cars and features an excellent 4-player mode - but loses out for me in that it feels a little more cheaply done - and the lack of FMV sequences takes away some of the gloss of Type-4. Not to mention the car models look a little dodgy.