[fastd]

I can't really think of a good reason to get a 4 speed.

A 5 speed tremec with a 2.87 1st gear with a 3.31 or 3.54 rear gear is a nice combo. I would opt for the 3.31 as I like to be able to get to 30-40 mph in first gear on hard acceleration. 5th gear on a tremec can be either .82 or .67 - this gear is a matter of preference. I prefer .82 cause it makes it a usable gear. .67 is pretty much just a highway cruising gear - can't really accelerate in it. If you want to be able to drive your car at above 75 for long periods than .67 5 gear would be better.