I run Speed Passion in all my cars. You mention the V3 which is a good buy on their website right now, 40 bucks. The MMM is the better choice at $60 right now. Speed Passion is funny, the motors are cheap today, tomorrow the MMM might be back to $90. When you see them cheap,buy em.

Whitrzac is right about the timing board, you don't have to buy one but it will up the rpm. The V3 comes stock with the black board the MMM comes with the redish orange board. The green yellow and blue boards will go up 10 degrees each. SP also offers rotors The blue one is rpm the green one is torque, not to mention they have a bunch more. I think people get the motors confused, they look similar. The V3 has V3 stamped on the front, the MMM has 3.0 with the MMM logo in the background.

In my F1 I run a MMM 21.5 box stock and am very happy with it. I have not raced mini that often, club rules are blinky 17.5. I run a MMM with a blue rotor. The mini runs good but could benefit from some more timing.

A lot of ways to tune an SP motor or confuse you depending how you look at it. I think the revtech and killshots are good motors, I also think there is a bit of hype to them. I race 17.5 offroad with stock MMM's and do pretty well against them. Get all the motor you want, still have to drive it.