SRT-4 is a sick car...Mopar makes awesome parts for it..
As for the bodies i'd like to see a
350Z BLUE or Rust
S2000 reddish most likely
Prelude blood red (but there are already 2 hondas) How bout a tiburon instead? green please
Eclipse definitely...don't know what color
Evo Eight...the only prob is that it's stock colors are limited
WRX STi in that gorgeous blue with the gold rollers..
SE-R Spec V you know it would have to be black..
240SX would be nice...they are kinda boring in my opinion stock so maybe go with a S15 with the factory body kit
Ion redline when it comes out

!!!
I'd kinda like XMODS to stay in the japan line, but i'd love to see
Porsche 911 Turbo in satin silver
BMW M3 in that sexy mica laguna seca blue (my neighbor has one..oh so sweet with those hamann rims and exhaust)
What the heck, Z4 needs to run with the S2000..