I have had good luck with Tenergy NiMh packs and I have a couple 10C Lipos for my CX2 heli from them. The first pack seems to be the best choice and would prolly be decent. Get one and test it for us.
I have had several hecell packs and have had no complaints at all. A buddy just bough a racing lot setup that had 2 of the tenergy lipos, they seem to be doing just fine as well, 1/10 scale setup.