Here are a few potential ARFs
Modeltech Magic 3D (definitely light enough for the LA, and no cowl)
http://www2.towerhobbies.com/cgi-bin...?&I=LXBGB0&P=0
Tower Hobbies Uproar 40 (no cowl)
http://www2.towerhobbies.com/cgi-bin...?&I=LXGPG8&P=0
Phoenix Sonic 25 Low Wing (no cowl)
http://www2.towerhobbies.com/cgi-bin...?&I=LXEDN7&P=0
The Sonic 25 looks more 'slippery' than the others so it would probably be fastest. The Magic is definitely intended to fly slow.