$2500 for about a 60% increase in power? That is fantastic. In my opinion, that price would be fine.
As for the install, easy is good. But I would much prefer a difficult installation with a reliable product rather than an easy installation but somewhat unreliable product.
I'd prefer the sleeper look. I think a car thats putting out maybe 150whp should still look like the sleeper that it is.
Finish I would prefer in this order:
1.aluminim
2.body color painted/primed (to cut down on costs)
3.real CF
4.flat black
5.designer cf look
For the intake, I'd probably like the SRI, whatever would provide reliable, safe, stealthy power.
Overall, for $2500, I'd really want something that is completely reliable. I don't want to have to be replacing the transmission/clutch every couple thousand miles.