I have had the same problems with my MGM120, sometimes it just stops working for a short time without any real heat on the outside, sometimes it accelerates in the opposite direction..
It's pretty efficient compared to the Warriors and the BEC seems to be ok too. No problems with smoothness either.

BK has the Warrior 12020 now, it's not too expensive. Not sure if they actually have some in stock now though, I waited 2 month for that and got one from ebay. That one broke rather fast, first the BEC stopped working and now it sometimes drives backwards. Not sure why that happens...
BEC failed due to the pins getting loose afaik.

Schulze seems to be pretty good, I liked my U-Force 75 but expensive and not that forgiving when it comes to warranty afaik.

Kontronik seems to have some nice ESCs but they seem to like the kontronik motors best.. ;)

Mtronik apparently has some good controllers too...

Then there are the sensored ones by LRP and Novak.

Graupner is coming out with the Genius 80 next month apparently.

But if you plan to wait anyway the MambaMaxx seems to be promising.