Fitment gurus I need your help.. 2GS

I am about to purchase my new wheels but I need help getting the proper offset for the VIP look. I am looking to go 20x8.5 in the front and 20x11 in the rear. 
 
The specs of my last wheels where:
front 20x8.5 +38
rear 20x11  +32
 
 
Here is the spec link for the wheels. Please provide what offsets I should go with and any explanation that you think is required.
 
[URL]http://www.weds.co.jp/english/products/kranze/popup/vishunu_size_20.html[/URL]

Nice selection... holla at the guys at [COLOR=DarkRed][URL="http://www.kyoei-usa.com/"]Kyoei USA[/URL].[/COLOR].. there is a guy by the name of Big C. He's a fitment guru-Arizona's best...maybe the best in the SW.

20x9 +7 3.5" lip and 20X10.5 +0 4.5" lip  mid disk... you'll need minor fender work... if your brave push the 20x11 +0 low disk. VIP is about aggressive fitment so anything above 20 on a 2nd GS is faking the funk.

You definitely want to go wider up front with lower offsets, as well as lower offsets for the rear. Shouldn't be too hard to find the answers you're looking for by browsing the forums and doing your research.