v6 upgrade

I'd start with exhaust and/or CAI. As for wheels, 18's look really nice.

18's are nice if you dont mind paying $$$ for tires. 17's look almost as good, and there are a lot more tires to choose from (and they're cheaper).

UD pulley and 3.73 gears are a good start to perk the V6 up a little. Exhaust and CAI will help a little too. If you really want to make it look good, you should look at lowering it at least a little. Even with 18s, that 4x4 look is still going to look funny.