That sucks, but it could have been worse...you could have gotten curbside body damage, or the guy could have collided with you.
This thread has stock offset info (first post) and other useful info.
Wheel Offset Discussion Thread... How far can we go?
There are a lot more threads here regarding aggressive offsets +/- pictures.
In case you go with aftermarket wheels, I'm looking for one rear 19" Rays sport wheel and would be willing to buy at a good price. ;-)