I have been flying helis for over 18 years, and have owned and flown most everything out there. The 50 size helis that i found to be the big surprise where those from Century.
May I suggest that you take a serious look at the Century Raven 50 or Falcon SEv2.
I have found them to be mini-XCell SE in flight characteristics and even more dependable (much better clutch and power system). Bearings everywhere, torque tube t/r drive, great rotor head (no flutter issues) and the XL-Pro type of tail rotor with 2 radial and one thrust bearing in each blade grip, full metal swashplate etc.etc. These things just seem to fly forever and never develop much play in any control system. With a 50, the power to weight is awesome and the disc loading with the stock 600mmm Graphite blades that they come with make it auto like a very lightly loaded 60.
Do yourself a favour and check out what owners are saying about them in the Century Forum area of RunRyder....available by scrolling down the menu on the left side of their mainpage. Check out what owners of other models you are interested in have to say in the other brand specific froms there on RR. I am sure, like me, you will find the Raven or Falcon to be very impressive and issue free.
www.runryder.com
Albert