RE: 90 sized engine recommendation
Sounds like a good match.
A LOT of excesss power, but not too much weight.
You'll want to put your battery packs as far BACK as possible, so make sure you get some extensions.
Also consider getting a large oversized battery.
I'm using a 4800mAh or so pack as far back as I can stuff it.
I can fly the plane all weekend long on one charge.... so the weight of the pack serves two postive functions.
Even with this extra weight, I'm usually the last one remaining, doing dead stick loops during fun flies, competing against other Stiks, thanks to the thick wings.