So I have decided to go with the Konig Feathers on my 06 MCS. I like that they are light, look good IMO and the price is hard to beat.
Michelin Pilot Super Sport is my tire choice, given its great reviews, so the only question left is size. I really would love to get as wide a tire on there as possible, will a 215-45 17 fit, rub?
I did lower the car with Swift Springs, about 1 inch all around.

 

I run this size on my lowered 04 R53. No problems with clearances.

 

It will mostly depend on your offset, I run that size, depending on if the car is loaded down or not I sometimes get a little rub in the rear, inner fenderwell only, on some bigger dips & bumbs. Very liveable though.

 

I just took off Swift Springs, I was on a 215/45/17 tire on 17x7 +40 and I never rubbed once. Even with a full size adult in the back and a couple duffle bags.

 

Depends on the offset and width of the wheel.
I had 215/40-17 on 17x7" wheels with 38 offset using H&R springs (lowered about an inch) and had rubbing in the rear wheel arch so I had to trim the plastic. So I would think 215/45-17 would even have more of a chance to rub.
I thought the Swift springs only lowered about 3/4" is your car really an 1" lower? I ask because it might make a difference between rubbing or not.

 

Thanks for all the feedback guys. I feel much more comfortable about going for the 215's
Quickmini, not sure what the exact drop is, I was given the exact measurements by the shop that installed the springs but I didn't save it. I think it was a bit under an inch.
I mainly drive the mini solo, or with my 4 year old in the back, and our roads are pretty smooth, so I'm not too worried.
BTW the wheels are 17x7, I think the offset is 40.