This guy has his E Revo geared 24/54 in an E Revo using a Medusa 36-60-2000 and was hitting 52mph with it.
http://www.rc-monster.com/forum/showthread.php?t=13551
He was doing top speed runs on Asphalt, and did say he would have to gear lower if he were bashing in grass, etc.
Choosing the right gearing can be tricky. Alot of it depends on what you plan on doing with the truck, bashing, racing or whatever.
Brian's top speed estimater is a valuable tool in decision making.
I think any of the motors you are looking at would work with great results, just with each geared a little different.
The lower the kv a motor has, the more torque it makes. However, overall effeciency depends not only on gearing and overall setup, but from motor to motor, differences in engineering design make all the difference.
From what I gather, the Medusa Motors sound very promising. I believe them to be a great performer in a wide variety of applications.
Where can I get a 36-60-2000? Everyone appears to be out of stock.