My vote is this one for 5s.....
http://www.rc-monster.com/proddetail...2_2.5df&cat=20
or if money is a bigger concern, this one...
http://www.rc-monster.com/proddetail...usa3660&cat=20
The Neu is a better motor, but the Medusa is also very good and a bit cheaper...
in motors, YOU GET WHAT YOU PAY FOR
1. MBX-6 T8 1900KV, RX8 ON 4S
2. MBX-5T 1520, MMM ON 5S
3. MBX-5 ONROAD CONVERSION 1515, MMM ON 5S
4. MRX-3 ON ROAD CONVERSION 1512, MMM ON 6S
5. TEN T 2650 T8, MMP ON 3S