[SPF2245]

Matt,
2) The BTR rear axle came around 2068 or so (anything over 2100 should have it).
3) I went with a carb (and many like me) because I didn't want to spend another $10K for FI. It doesn't offer me enough increase in power to justify that cost. Then comes all the fun of installing the extras needed to run FI...it just doesn't make sense to most of us when carbs work great.
4) 17s do offer a huge increase in handling partly because of the shorter sidewalls and more so because there are better tire options (ie modern performance tires are not made in P295/15s or larger). The downside is ride suffers but don't think for one moment these cars are Hondas...so, it's a trade off many make. I'd take a look at two side by side with each size and see what works for you.
5) Me...once, I learned my lesson.

Final note, these cars are typically not forgiving. The peddles are ofset so it's easy for rookies to hit the brake on a speed shift instead of the clutch, pop the clutch into a lower gear and you'll lock up the rear tires, they are short wheelbase monsters that bite when driven stupid...and they lack ABS so when you do get over your head, better have your stuff together. My point, if you want one...go for it, just remember what these cars are...dangerous toys (and I love mine).