I say get the 1SS/RS as long as your funds can support this. Otherwise, I would get the 2LT/RS over the 1SS. (I prefer lots of cool options on a car that still fast, than a basic really fast car)
Both colors you chose are going to be nice. Depending on what you want to do cosmetically, there is still no telling which color to suggest to you. There are going to be so many of these cars eventually that I wouldn't worry about the rarity of the color. Go with whichever one YOU like best. I like RJT because it's one of my college colors, but I like IOM better in a sunny area because it really shines a lot more in person than in pics if you haven't seen one in person yet. RJT looks better on days without much sun, though.
I don't know anything about exhausts, but I suggest waiting till you pick what model you want before looking too deeply at exhaust options.\
Good luck!
