Well, do some reading here. If you scroll through some of the old posts, you'll find some "which gen is best" posts. You can get some basic specs here:
http://www.ntpog.org/specs/
You will probably want a 4th or 5th gen. The 4th gen had the "cockpit" with the wraparound dash, the 5th gen has a more traditional interior. When talking about a VTEC 4th gen, they are faster than the 5th. In '96 (last year for the 4th) they switched to OBD2 which robs some power and detunes mods... avoid it if you can. The '96 and 5th gen aren't bad, though, it's just something else to have to work around if you plan to mod heavily.
The 4th gen will definitely be cheaper, but clean VTECs are getting harder to find. You can always consider a non-VTEC and an engine swap as well.
The 4th gen VTEC was rated less than the 5th gen for power, but they are essentially the same. The 4th gen weighed a little less, making it a little quicker.
I personally like the 3rd gens, but finding one in NJ that isn't a cancer patient might be tough. You might also not care for the 130HP mill that's in it (slow compared to the H22 VTEC).
4WS was only available (in the US) in the 3rd and 4th gens. Europe/Japan still get it in the 5th gen. 4WS is largely good for parking and maneuvering in tight situations. Adds about 80 lbs. if I recall.