I weight around 330lbs, and the used rear wheel from hell's rim bent out on one side. I was looking as some sun rhyno lite rims as a replacement and have a couple questions.

1) is 32 spokes enough? I'd like to reuse the hub I overhauled 2 months ago.
2) if I should rather go up to 6 spokes, what's a good but not break the bank hub? I've read that the shimano xt would fit the bill. Any recommendations? Looking to keep the 8 gears in back.
3) This will be my first wheel build. Was looking at double butted or straight gauge. Seems that the db spokes are stronger, but harder to build with. How hard or how much stronger?