RE: GP eagle 580
it's not really a 3d airframe IMO . yes 45 46 os super tiger will work I highly dout your going to come out of a hover with that ..
if your heart is set on 3d and your heart is set on nitro . like everyone and there mother is going come say . you'll do better with a profile or a U can do or something
try the tuff yak from value hobby its like 114 bucks and not bad OS 55 AX
if you consider electrics there are many 3d electric planes in this size that simply rock !! look at 3DHS extreme flight PAC
If i was you I'd buy 3DHS bigger Volex or I'd buy the 57" SHP