I'm very happy with a Medusa 60x2000 on 4S in my 8B. It's not crazy fast, but is still as fast as any top nitro and has a lot more punch to clear jumps out of corners. If you want a little more speed go with the 60x2200, but the amps jump up a lot from the 2000 to 2200 which will require better batts or cause your batts to get hot.