Yeah If I go with the D2's its going to be
18 x 8.0 +48 5h x 114.3
18 x 9.0 +50 5h x 114.3

However I was looking at the Enkei RP03 type RC which I think are beautiful wheels:

Size options:
http://www.enkei.co.jp/en/p_detail_rp03rc_pri.html

I would guess
18 x 8.5 F
18 x 9.5 R ?
Not sure on the price though...I have to look into it some more.

 

^^^ Those Enkei's do look good, but +42 (F) & +45

 

Looks like i'm going to go with
18x8 +48 (F)
18x9 +50