Offset for 99 Impreza rs
 

I own a 99 impreza rs. I found a pair of 17" rims with an offset of 42. Is that 2 little? What is the minimun offset i should put on the car and the maximum? What kind of tires can i get also. I wanted to put 215/45 but i hear that there is rubbing problems. My car is dropped 1 inch with eibach prokits. Please help me out with the proper offset and tire size guys.:) Let me know your info