I was looking to get either this

http://www.3dhobbyshop.com/detail.aspx?ID=2422
Extra 300

OR

http://www.3dhobbyshop.com/detail.aspx?ID=2436
Extra 300 combo(this one has different motor/higher speed control, would it be that significant of a difference??)

OR

http://www.3dhobbyshop.com/detail.aspx?ID=2435
(edge 540 combo)

I am new to electrics and mainly have big gas planes, but not long ago I got a e-flite extra260 which got me hooked on these little 3d machines...Any help would be great, thanks.