Check Tirerack.com I think they do make Brembo 345mm 4 piston kits that would fit your stock wheels for around $3k.
http://www.tirerack.com/brakes/resul...y=BigBrakeKits
I don't really know if slotted or drilled rotors are better. I bet you can find a lot of opinions on this topic if you do a search for it.