Need a 6s ESC! Which?

[gyn77]

Hi everybody,
I'm running with my brushless savage (ex Serum Bashing Savage) with 4s maxamps, MM and a feigao 9XL and it work very good, but now I'm thinking to run with 6 lipo!
What esc could I buy?

I like Quark Monster 125, but I read that has some problems (cogging?) to 6s at full charge and I don't want fry it.
The alternative Is MGM Compro 160, but is out of stock and I need it soon.
What I can do? Buy the Quark or wait for MGM?
Something else?

Bye,
Alex.