I'm looking at the SebArt Wind 110, roughly 8.5lbs. The is designed around a Hacker A50 16L and 8S battery setup but the reports are suggesting more power. Installation is specific to Hacker, so that and Scorpion are the two direct-fit options that I know of. I don't want to start hacking up the nose of the plane.

Links to the motors:
[link=http://www.espritmodel.com/index.asp?PageAction=VIEWPROD&ProdID=4417]Hacker 16 and 14[/link]
[link=http://www.scorpionsystem.com/catalog/motors/s40/s-4035-250KV/]Scorpion 4035[/link]
[link=http://www.scorpionsystem.com/catalog/motors/s40/S-4025-16/]Scorpion 4025-16[/link]

The plane:
[link=http://www.sebart.it/110&more.html#windS110anchor]Sebart Wind 110[/link]