its all down to 1 major question:
Do you want a fully controlable 3d helicopter or a kids toy?
Any 4chl or contra rotating heli like the Lama is fine,.. but just a gimmick.
if you want a real 3D fully controlable model I would look at 6 chl models like the Esky range, Cp2, BeltCP or KINGII.
I'm hooked on these helicopters and have 6 now.
If you look around you can find some real bargins on E-bay.
Everyone seems to buy them and find it much harder than it looks.
I have picked up 3 unwanted gifts from e-bay for under £50 and when you compare the technology between the basic helicopters and these Esky 6chl, models you'd be crazy to buy a 4chl contra rotating heli.
Very expensive, but this site might give you some ideas:
http://www.buzzflyer.com
or this forum:
http://www.rcgroups.com (look under mini electric)