I thought so cheers for that. The whole offset thing confuses the hell out of me, I know that the smaller the number the farther out the wheel hub sits from the centre of the wheel but I'm completely in the dark as to how you can have different offsets and the affect it has 
well i have some 18" monza reps on mine with offsets of 45 (instead of 51) and i dont see any problems with it at all. The only difference is that the wheels stick out 6mm more which is un-noticable really.
Anyway, i think having wheels stick out a little makes it look sporty.