Alright, here's the dealio with Z32's.
If you're alright with mediocre performance, and not really looking to break any land-speed records, go for an N/A model (they come in 4 variations: 2+0 (no back seats), 2+2 (back seats), Slicktop (2+0 - no back seats, no t-tops), and a convertible. As for the Twin Turbos, they only come in one setup, from the factory, and that is 2+0, T-Tops. However, that only applies for the USDM market, the JDM market is a hole other crap-shoot.
Common problems? MAKE SURE THE TIMING BELT HAS BEEN DONE!!! The VG30 is an interference engine, aka. the timing belt snaps, everything hits everything, and you're out of an engine. Another problem is the stock injectors crapping out. They're easy enough to fix, as long as you've got some time, and the proper tools (you'll have to pull the plenum to fix this, or ghetto dremel it - your choice). Another, minor problem would be our shifter bushings are usually mush by now. They'll only cost you about $5 to buy, but depending on your mechanical experience, it could take you anywhere from an hour, to 5+ hours to replace (you have to dismantle most of the center console, and if you've got tiny hands you can do it from above. I did it from beneath which meant on top of dismantling the center console, you've also got to drop part of the exhaust, remove the heat shield, and crawl underneath the car - starting to get the idea of what it's like to work on these things yet? lol).
The Z is a very rewarding car to own, as long as you can put up with down time, as well as the actual effort required to work on them. I wouldn't give mine away for anything
As for good Z32 sites, check out these two (as they're the biggest, and not dead).
www.twinturbo.net <- loads of information, and write-ups but the users are very harsh/un-accepting, so be careful. Also, the forum is rather archaic.
www.300zxclub.com <- great site, with loads of information as well as a proper forum setup. Make sure, you properly fill out your user information before you post as you'll get yourself torn up pretty fast.
www.niclub.ca <- local Z site
Kymoti, go to 300zxclub.com, and search for the member DualZSF, or DualZ32 (it's one of those two). He makes all of the proper LED conversions for Z32s and you will not be disappointed.
If any of you have any other questions feel free to PM me, as I'm pretty knowledgeable with these cars - mine's in a million pieces right now, but if I've got the time, I don't mind helping you guys out.