Which Castle motor to get when the MMM combos come out?

[hemiblas]

After my MMM went out I decided to try the MM 7XL combo everyone keeps talking about. PUt 40mm fans on the motor and the ESC and its been running solid for about a week now. I cant believe the power the combo puts out. I'm geared the recommended 20/68 and in 90 degree weather the esc doesnt go over 122 and the motor 145.

I really cant imagine much more power, but all the guys running neu's seem to think an XL can is nothing compared to the better motors and I'm looking to take the next step.

I read about the 2 new motors Castle will be coming out with. Seems like the 2200rpm version is going to be 75mm long, an the 2650rpm version is 67mm long. On 4S am I better running the 67mm version or getting the 75mm version and gear up a bit. I'll only be looking for 45mph range on an emaxx 3905, but I want as much torque as possible. Any opinions.