I would say I'm in the 'resto mod' category.
I perfer the exterior of my cars to be mostly stock, with only minor tweaks, if any at all.
Same goes for interiors... Stock and simple. I don't need any electronic stuff. No fancy stereo system. No DVD or PS3 or TV's. A CD player and some upgraded speakers in the stock spots are just fine with me.
Doing restoration work for a living has instilled me with some habits, and I'm incredibly picky. If you have any flaws in your car, I'll find 'em right away. It makes cars shows not much fun, since in my eyes, 75% of the stuff out there is junk...
I'm a stickler for things that are correct for a certain car. I also like the uncommon stuff. I got an aluminum hood and core support for my 442, and I've also converted both the 442 and wagon to non a/c set ups with all the correct factory pieces. The wagon is also getting a factory manual trans swap that I have all the parts for. It's mostly the novelty of the hard to find parts that I enjoy.
I'm not a fan of lowered cars. I like the stock look. Besides, clearance is tight enough in some cases and roads can suck up here, so I'll keep my car at the normal ride height... I've already smashed enough exhaust tips and cracked enough air deflectors...
Big wheels don't do it for me. 15's are fine with me, and 17" is the biggest I'd ever consider.
Drivetrains however, the sky's the limit. Again, the simpler the better. I can live without chrome and billet everything. A clean looking engine compartment is nice.
I just like clean, straight cars that have a nice attention to detail, and are driven and enjoyed.