I debated LM, CH, and RS-GT's. I eventually decided upon the RS-GTs and am happy. If you are oriented towards the lightest wheel then RS-GTs or RGRs may be what you want.
One advatage to the CH is that it is a cast wheel and would be easier to repair if you rash them. I dread curb rash on my wheels - so far so good with the RS-GTs.
2015 f80 M3, 2010 GT3RS