[lutach]

If I had to choose some motors, I would go with the following with 8mm shaft:

http://www.hobbycity.com/hobbycity/s...MT-W63H2_198kv
http://www.hobbycity.com/hobbycity/s...utrunner_193Kv
http://www.hobbycity.com/hobbycity/s...MT-W63K2_195kv

Now these have 12mm shaft, but would also be good motors for this project:

http://www.hobbycity.com/hobbycity/s...ner_(eq:_70-40)
http://www.hobbycity.com/hobbycity/s...ner_(eq:_70-55)
http://www.hobbycity.com/hobbycity/s...ner_(eq:_70-55)