Sounds like a pretty good offset for the MK2.
They will fit nicely, and they're probably about as close as you can go to flush without having to roll the fenders.
You could put 215 or 225 on the front with that offset. You shouldn't have any rubbing problems. Since you have 245's on the 8's, 225's on the 7's will make the tires look more matching as far as buldge goes. If that's even important to you.
If you're going for pure performance, and handling characteristics, it all depends on your driving style. If you find yourself oversteering alot, keep the smaller tires up front. If you feel you understeer more than you'd like, try 215's or 225's up front.
Jeff might be able to shed a little more light on this matter as well.
BTW, Enkei RP01's are a sweet wheel for the MK2. in my opinion of course.