I know a lot of people prefer the Skybolt. And it's a great plane..
But would have lean towars a Sig Hog Bipe for a couple reasons.
1. You said "beginner" bipe. The hog is a little slower plane, and a bit more forgiving then the bolt.
2. You said "electric". Neither is available as an electric version. So you'll have to convert it. I looked at the bolt, the Ultimate, and the Hog. And the first two don't lend themselves to conversion as easily as the Hog. In fact, the Hog is an absolute dream to convert. I bought mine (also an ARF) at an auction last February. A little cutting and a little work and I had a wonderful battery hatch. Below is the thread of my work... I'd guess, if you had all the materials, you could do a conversion in an evening (using CA) or two (allowing glue to dry.)
http://www.rcuniverse.com/forum/m_8871005/tm.htm
Oh... definitely go with the two-aileron-servo setup.