~100W 2s motor, what motors are efficient these days?

Hi,

I am after a motor setup for a new plane (GWS E-starter) and I am wanting to run it on 2s due to the abundance of 2s 1300mah GensAce batteries I have. As I understand I would be after ~1600kv motor to go with that battery setup and a motor around the 40-60g range.

What makes are efficient? If it helps I am in the UK, I have seen these Keda ones, are they any good? Just after a little direction as there are so many motors available!

http://www.giantcod.co.uk/keda-thumr...-p-403663.html