What controller should I use?

[Todd85VT]

Hello everyone. I just bought an e-maxx 3905 and Im going brushless. I have a Nemesis Blue 11XL motor. I am planning on running my setup w/ 6s lipo (two
3s packs wired in series). My question is what controller should I get, either a Quark Monster Pro 125b or a MGM Compro 16018. I really like the fact that the Quark is very smooth so I've heard but I know it can be trouble on 6s lipo. The MGM sounds good except for it going into reverse at slow speeds instead of the brakes. Should I get a different motor altogether and run 5s w/ the Quark or run 6s w/ the MGM and the 11XL I already have? Also, how does the MGM perform on 6s? If anybody can give some ideas/opinions form experience it will be greatly appreciated. Thanks,
Todd