I too am trying to decide, though my color is Redfire. The 18" deep dish black bulliets I've seen on red cars look very good in my opinion. That's one of the wheels I'm considering. Check out the very lengthy Redfire thread here. Lots of pics.
_____________________________
the vos stang ... '07 4.0L 245 cu in V6 Redfire Premium Coupe - auto - custom Dark Charcoal leather - Shaker 500 Sirius GT rear cover, true dual exhaust w/ Magnaflow mufflers
my buddy has an 04 torch red gt with black bullits....18x10 rear and 18x9 front...looks amazing...definately a good look. he also has good tire combo for that set up...315/30zr18 out back and 265/35zr18 up front...awesome contrast...id go black...just my .02
_____________________________
2005 Mustang GT black 5-speed(13.39 at 101.51...completely stock)