go with XTR, its much better in my opinion. plus there are hundreds of helis to download including the T-rex 450 xl and se. and to me it has the most realistic graphics. here is a site with 100+ downloads for XTR.
http://www.rc-sim.de/dl_engine_eng/i...0a6a9f96ee6aba
they have 168 heli downloads for XTR.