Try BBS for wheels and StopTech for breakes.. they're generally the best (in my opinion)
Yes, I too had been looking and actually asked my dealer. Funny enough, the guys in the shop told me to call Bob, the owner at stratmosphere as this other member has mentioned. I am from Jersey and stratmoshere is from NY (Syracuse), so the distance isn't bad. BUT, the dealership I bought from is so high on this guy, they have a direct relationship...stratosphere will ship direct to the dealer and the dealer will install his products. *Without* any changes to the warrenty!
Just came across this post have you installed the stage 2 upgrade yet? I'm also looking at this option since the full stage 3 seems is little out of my reach at the moment.