... When picking a motor keep in mind that the Twister was designed to fly with a .35. Most folks today use a .46. ...
OT for the OP, who is going electric, but still:
The Twister was designed for a Fox-style 35, even, which does not have an easy engine run to get used to. I'm going to (OMG!) disagree with Brett a bit. His suggestion for a 25LA is OK if you keep the weight down, but I knew a guy who flew a Fancher Medic with a 25LA, and I always felt it was a bit marginal -- he did great until the wind started blowing, and then he didn't; a slightly bigger engine on that plane, plus enough tail weight to even it out, would have made it better I suspect.
The reason a lot of us use a 46LA, specifically, is because it is stupid-versatile, easy to find on eBay, and tones down very well. So if you set it up for the plane, it'll fly my ultra-porky 53 ounce Twister, or (with a different setup) it'll fly a 40 ounce Twister. But with yet another setup it'll also fly a 64 ounce almost-an-Impact, so you know that 40 ounce plane is way more than it could fly.
So if some beginner asks "I'm building a Twister, what engine should I use?" I'm going to say a 46LA, because I know that if they build light or if they build heavy, the engine can be made to work well. If I say "25LA but keep it light" then I may be setting someone up for a fall. If I give a laundry list of all the engines I know will work (see below) then I'll just confuse them and they'll buy some piece of crap at random.
Out of the engines that I have flown, I think a better combination would be a Magnum 35 (which is a modern high-RPM Schnuerle-ported 35 and runs
nothing like a Fox 35) or a Tower 40, both of which are harder to find than the 46LA. I've also seen Enya engines suggested a lot, by people I trust, but I can't vouch for them personally.