there are only four gang cars:
Cubans - Cuban Hermes
Hatians - Voodoo
Streetwannabes - Gang Burrito
Bikers - Angel
I think the funeral voodoo is the best looking car, it only comes up during 'two bit hit' or whatever that mission is called.
There are two types of sentinels:
Sentinel - Normal, with front spoiler
Sentinel XS - Full Body kit, tuned engine, hood scoop, rear spoiler, rear wondow louvres. basically your mafia package, but they're just normal cars.
there are no kurumas in this game, since the karuma was a 90s car.
there is a blista compact - the CRX - but there is no minivan blista, the moonbeam is still there though (chevy astro).
most cars in this game are RWD, though some are FWD for some odd reason. the admiral, hermes, and regina come to mind.
most police vehicles are 4WD, the cop car, FBI rancher, and FBI washington are 4WD, don't know about the Vice Cheetah, the swat van, or the barracks OL, since i haven't driven those, well, except for the stinger, i just didn't check.
to do a burnout in a RWD car hold down gas and brake at the same time. a few FWDs do peel outs by using handbrake and stepping on it, such as the hermes, but FWD is lame. the stinger is FWD.
cuban hermes and gang burrito are 4wd
all 4WD vehicles are RWD biased.
the banshee in GTA3 can be found almost anywhere on the second two islands, you obviously didn't do any missions in GTA3.