I´m about to start the same conversion myself. I will be using an Actro 24-6 or 32-5, Jeti Advance 77 Opto Plus, 8s batteries (probably Flightpower Evo 3700 mAh) and something like a 16x10 APC-E prop. If I can´t get the CG far enough forward with the light 24-6 motor, I will use the 32-5 which is a bit bigger. But CG should be doable with the lighter motor as well I think, but if you want a bit of of headroom, go for the 32-5 right away.

Actro and Plettenberg are pretty much the highest quality motors there is and are priced a bit higher than most, but worth every penny. If you´re looking for cheaper options, let us know. A suitable motor from Plettenberg would be the Xtra 25-12. A bit bigger than the Actro 32-5 and can handle a bit more power, but a plane like the Epsilon will have superb power with the Actro setup. The Xtra 25 series (although the lower revving 25-13) is what people use in light 2 meter airframes, so it feels a bit overkill to me.

Edit: I just checked Hobby Lobby and the price for the Actro 32-5 along with the Jeti 77 Opto Plus controller (package deal) is $479. http://www.hobby-lobby.com/actro-32.htm

/Erik