scott,
ill give you the answer i gave you in the email, so everyone else can react to it.
1) personally, i think theyll look better.
2) youre getting a great deal on some very expensive, very high quality wheels.
3) everyone has cobra r's, but no one has the saleens on their X (with the exception of a handful.)
4) your truck is lowered a bit; its a sport truck; the 18" saleens are gonna fill out the wheels well more than a 17" cobra r.
5) THEYRE SALEENS! theyre just great wheels.
so, i say go for the saleens, but make sure you do your research about the powdercoating and fitting and all that crap. dont learn the hard way; learn from my mistakes, heh

also, i just saw a new thread from rogue about powdercoating - he said to get a hard copy of the estimate first, cuz he ended up paying twice as much for the powdercoating in the end - dont get ripped off.
good luck
