I'm getting rid of many lenses that don't get much use (http://www.ebay.com/sch/dshin525/m.html?_ipg=50&_sop=12&_rdc=1 in case anyone is interested) and will use the proceeds towards a 50mm Summicron. It seems like M goes for much more than R? Is one better suited for the Nex 6 than the other? I wanted to go with M b/c I already have the Hawks adapter...but based on the price difference, a R + metabones adapter will still be much less then then M. Also are their quality R-Nex helicoid adapters (like hawks factory) readily available? I really like the improved MFD that the helicoid adapters allows. Thanks.