I am looking to get new wheels as well... I was told that: ex.) if you were to say get a rim that was 50 offset the tire would be mounted dead center. Then as the number gets smaller the rim is mounted more towards the outside lip causing the inside of the rim to get closer to your wheel wells and harness equipment which can cause problems. It really depends on how wide the rim is for your vehicle.... 7.5, 8, 8.5", ect...
I am looking at this package here for my BSP Scion 08 tC:
Wheelfire
With that I think I need to add a 1.5 inch drop kit so that this thing sits flush...
Please feel free to post comments, recommendations are more than welcome, and any other info. you can give me would be great.