Top 5:
Mitusbishi Evo VIII: In standard form, there's good grip, but the brakes are in another league. Seems to stop on a coin. Cornering is good, only understeers if you indulge in a bit too much throttle early in a bend.
Toyota MR2 Supercharged AW11: Approach corner, scrub off a little MPH, lifting off the throttle, flick into bend, carefuilly reintorduce throttle, play around with oversteer. Need I say more?
Any Lotus Elise: Not one for power, but weighs as much as a blanket, so it' not slow, and it corners brilliantly, can be provoked into oversteer. Sport 190 is most fun, but can be a tad twitchy. Toyota-engined 111R makes you work harder for the power, but brilliant all the same.
RUF BTR/CTR: Both included together, because they're more-or-less the same, bar a bit more power on the Yellow Bird. Unique Porsche handling 9in other words, understeer entering a bend, oversteer on the way out) provides a unique challenge.
Lotus Elan: I like classic British sports cars... a lot. Especialy this car. 4-speed gearbox limits the top speed somewhat, and the standard power output may seem a bit modest by today's standards, but that's not a problem when you take into account the handling. It corners at absolutely silly speeds!
Special mention (stuff that I couldn't fit into the top 5, but are good enough to be mentioned:
Ford Ka: Not very fast, and you probably think it's either ugly or a ladies's car, but it corners nicely. Neutral handling, quite agile, rarely understeers. Just needs more power... or maybe the inclusion of the SportKa model.
Fiat Coupe 20v Turbo: Very throttle sensitive on corners, frantic power delivery, but I don't think this car could cope with much more power easily. All good fun though.
Ford Focus RS: A front-wheel-drive car, with hardly any understeer, it seems. Lots of fun, quick quick, though can get a bit twitchy if you're too playful with the accelerator.
Triumph Spitfire: Well... it's British! (Oh, and the handling's a lot of fun. Has to be pushed, but there's enough power to give us a chuckable sports car with a springling of oversteer). Good clean-licence pleasure.
Honda Beat: Tiny engine, but drives a bit like a go-kart. Deserves a Fireblade engine...
Bottom 5:
Toyota Prius: Poor turn-in, feels a tad remote (probably due to lack of manual gearbox). Not something you can enjoy thrashing to death at all, and not particularly quick or agile. And as mentioned below, it's an anti-car.
Mazda Familia Sport 20: Modest, I know, but this could, in stndard form, have been a decent little saloon... but it's strangled by a 4-speed (probably automatic) gearbox, which makes it very sluggish exiting corners.
Chrysler Crossfire: A rear-drive car, with 230BHP should seem quite nice... well this one is fairly stable, and it does move... and that's it It's impossible to provoke ANY oversteer, for a start. THere's front-drive cars that get their tails out more easily! Not enough fun to be worth any hassle, really.
Nissan Micra/March K11: Soooooooooooooo average. Very dull. I'm sure it's alright as a shopping trolley in the real world, but in GT4, it doesn't really do anything particularly well.
Vauxhall/Opel Vectra 3.2 V6: Understeery, seems to go wide on many corners. Struggles with it's power, but isn't fun Fiat-Coupe-Stylee, as detailed above.
Special mention....
Any fridge-shaped K-car: Why?
Daimler Motor Carriage/benz Patent Motor Wagon: I know it's where the whole car thing started from, but these two cars really are painfully bad. You can't go above 10MPH (ok, maybe a lot faster down a hill, but on bicycle tyres?).... and whatever you do, don't over-rev them.....
Still, it shows how far cars have come in the last century, but the Ford Model-T is a much more pleasureable nostalgic ice-breaker.