I bought this set up for this season, I am in a similar level to you:
4 x 18 x 9.5 ET35 D-Force LTW-5 Wheels from Bimmerworld (they were on sale @ $275)
Nitto NT-05 265/35 tires
Macht Schnell Spaces: 15F, 12R
The tires and wheels have been great on the two days I have been out and performed extremely well. The Nitto's seem to be wearing well and were grippy and predictable. I am not ready for R-comps, and these ultra performance summers fit the bill. As a heads up, after two sessions, I am getting very faint rubbing at full left lock
I have been using Performance Friction PFC-01 pads too. I am still getting used to these much more grippy pads!
Here they are in use last week:
Hope this helps.