New rear derailleur needed...
I currently have my S-works CX set up with a single front 42 and a rear 12-27 cassette with an ultegra med cage (broken due to locked pulley). I would like to get some more range because I want to keep it single up front, so I want to switch to an XT 11-34 and a single 44 front. My question is should I go with a long cage XTR M952 ($95) or with a long cage XT M750 ($57) or a med cage XT M760 (newest xt model) ($70). These are the options I can currently find to purchase in terms of price/performance. I don't know if the shifting advantage of a med cage outweighs the range advantage of a long cage. Is long cage for cyclocross just a bad idea?