Well if it is a sort of scratch built foam Eagle 2, YOu could use a MP 25 or 32 sized motor and a 3s battery.
25 sized motor
http://www.hobbypartz.com/monsterpow...ess-motor.html
32 sized motor
http://www.hobbypartz.com/monsterpow...ess-motor.html
ESC
http://www.hobbypartz.com/volcano-se...hless-esc.html
Battery
http://www.hobbypartz.com/83p-2650mah-3s1p-111-30c.html
http://www.hobbypartz.com/83p-5000mah-3s1p-111-25c.html
For the 25 sized motor run an APC 13X8 prop and you should all of the power you need and then some.
For the 32 sized motor run a 14X8 and have a rocket ship.
Buzz.