Owned many'a '02's!
Buy the driest car you can find - body work is A LOT more expensive then motor work. Look at rear shock towers, sills, window frames, spare tire well, 1/4 panels, floor pans, front "frame rail", and floor pans
I used a couple as daily drivers - when there was salt on the road I wold always try and wash the car off every few days...
They can be VERY dependable when if you take car of them - adjust valves and change oil religiously!
Hot rodding them? Hell yes! S-14 conversions make the car stupid quick, 304 cam and Weber 45DCOE's make a bad ass little M-10 motor, (it may not like to idle but it sounds bad ass at full song!) Throwing in a 5-speed is perhaps THE best thing you could do for one!
Tii's and the Kuglefischer mechanical pumps can be "finicky" but the old-school fuel injection is a hoot. If you REALLY want a killer little M-10, find yourself the rare,(read "expensive"), Alpina A4 slide throttle injection - FUCK that's a cool set up and you can pretend like your Hans Stuck or Ray Korman in the good old days!
Dammitt! Now I'm all waxing poetic for another damn 2002!!!!