Long post is long... catching up on all the ones I've missed.
2006 Mercedes-Benz CLS500 vs. 2012 Volkswagen CC - Passat. Always loved the Passat, but I've never had a liking for any Merc.
Porsche 911 GT2 RS vs. Ferrari F430 Scuderia - None. I don't like Porsche, and I don't like Ferrari.
E30 vs E36 vs E46 vs E92 - E30 all the way. Gotta be my favourite BMW by far. That and the 2002.
NSX vs. BMW E9 - Probably the NSX. I have a thing for a few classic Beemers, but the E9 is not one of them.
Smart Fortwo vs. Toyota iQ - The Toyota. I like small cars, but there's a line, and the Smart is just too small - and that's coming from someone who's only 5"! Plus the iQ looks kinda cool.
Ferrari F40 vs. Ferrari 458 - Probably the F40, despite not liking either.
Lamborghini Miura P400SV vs. Ferrari Daytona - Miura all the way! There is only one Lamborghini I love, and it's the Miura.
2001 Audi S3 Quattro 210 vs. 2003 Volkswagen Bora 4-MOTION Sport - Bora. Like I've said before, with the A3, or in this case, S3, the feel I have for it is that I liked it, but then a certain person got one, and now I don't like it... and I can't help but not like it now.
Toyota Supra vs. Mitsubishi 3000 GTO - Supra. In silver. With dark silver wheels. I saw one just like that yesterday... it looked mighty fine.
2006 Mini Cooper S vs. 1967 Morris Mini Cooper S - Old Mini. I just love it!! I've been lurking around on eBay looking for one. There's loads, going really cheap. I just need to find the space to store one!