The XBR is the speed controller, the EX is the motor. The XBR speed controllers work fine. No clue on the LRP. If it's like the Spere it could be hit or miss on how long it works, but when it works, it runs with the best.
As for motors, if you are racing, the sintered rotors are better than the bonded and are worth the extra paper route money.
Speed Merchant Rev7, Tekin, TQ Racing (wire), Team Tamale
RC Excitement - Buy where you race, support your local tracks.