First...welcome!
Second....the rims...I painted mine black...
It was fairly easy (once I figured out what paint to use), just sand and used black primer (no paint, or clear).
If you are between black and chrome, definatley go for black as you wont be able to get a good chrome finish on them without shelling out some serious cash.
The Pontiac symbol is on the centre cap, and can be poped out from the back side once the rim is removed.
For intake, go CRABS or nothing! Havent heard much with the Injens, but a friend has a 06 G6 V6 with the K&N Typhoon, and it constantly whistles under acceleration, very annoying. I have the CRAB Option 3 and absolutley love it, and best of all, no whistle! Dont know what the prices for the K&N are in the states, but up here, the Typhoon and full CRAB (w front pipe upgrade) are about the same price.