Im still kinda confused. Most foam electric planes are not as big as a .40 sized glow plane.

Im going to assume you are already an accomplished pilot, so the following list of recommendations are for accomplished pilots only.

A lot depends on what style of flying you want to do, where you plan on flying, and how much you want to spend.

For large outdoor aircraft (not foam) that are electric, I would suggest you take a good look at the Fliton stuff. They make quite a few electric aircraft that are not only hot looking electric planes, but fly well too, and while not quite .40 sized, are fairly large.

If your looking to convert a .40 sized glow plane to electric, this can get expensive. Large brushless motors can easily run $250 or more, and you will have to run 6-8 lipo cells to power it.
There are still quite a few options here though.

Here are my recommendations.
Indoor 3D planes (foam) - Ikarus Shockflyers found at www.shockflyer.com
Outdoor 3D planes (foam) - GWS Formosa(can be modified for 3D), E-flite Ultimate.

Outdoor 3D planes (balsa) - Any of the Fliton electric planes. Mini Funtana,

Outdoor glow conversions - I would suggest looking at the Great Planes .40 kits. In perticular the Ultra Sport 40, looks like it would be a GREAT 3D outdoor plane.