Well, I say go for the 2001 if you like it. You will get a lot people telling you to wait for the 2002's. Maybe you should, if that's what you want. But here are my reasons:
I bought a 2001 GXE LE on 7/26/01, less than a month ago. Needless to say, I got a GREAT DEAL on it. I mean GREAT!!! So that's the main reason I would recommend getting a 2001. Plus, they are great cars. (so far at least)
There are some nice advatntages to the 2002 as well. Mainly the restyle and larger and more powerful engine.
Hey, each one has it's good and bad. For me the 2001 was the best choice. YMMV
Just make sure to get an Altima, whether it be a 2001 or 2002!!!!
JB