Motor questions

[Morepower]

I'm looking at a brushless sytem for my emaxx. The novak hv4.5 looked good, I had a gtb4.5 in a pede it was very powerfull and no problems, but I have been seeing quite a few threads about people having troubles with the hv system. So I was thinking of getting the mm controller with a feigao 7xl,8xl or 540c 8xl. What is the diff between the 540c and regular 540? Which motor would be best for the e for bashing? More power/speed is best but I don't want to have troubles with the controller. I would like it to be at least as fast as the hv4.5. I am running the 3.3 axles everything else is pretty much stock so if something needs upgraded let me know, my batts are matched ib4200 7cell packs, don't see lipo in the near future. Thanks for any help/suggestions.:032: