Yes, I am very happy to hear that. NiMH are heavy, and underpowered for BL- as you know.
Well, if you want to go with a hardcase lipo then I suppose the
Losi 4s would be OK. IMO the wires look a bit too small (14AWG?). There's also this
PolyQuest XP 4s pack. I don't know who makes the cells for Losi, but the cells in PolyQuest/Neu/Flightpower lipos are the best quality cells out there. The wires appear to be larger (12AWG?) and that is a big deal with 1/8 BL power systems that can draw lots of current.