I just bought this Hobbywing brushless system from KD and it seems pretty good for the price. 150-bucks gets you a 40mm x 68mm 2700kv motor and 120-amp speed control with fan, good up to 4s lipo. I bought the single motor plate and dust cover from the e-revo brushless edition and am using the stock 68 tooth spur gear with an 18 tooth pinion. I mounted the esc with double sided tape, but later found a plastic esc mount, 2-pinion gears, some shrink tubing and screws in the box. The kit also comes with a programming card. Seems like a very complete system and a great price for what you get.