I'm running a 7T Reedy Sonic Mach 2 in my B5M, really good motor, although I think part of that is running a decent ESC. (Orion R10.1)
I'm in the process of Kitting out my new Bmax4 with Electrics and I am going for a Reedy again motor wise, 5T this time. Speedo I'm going for LRP works Flow Team, heard good things about them and a fair bit cheaper than buying another Orion