Anyone that has Flex bars loves them from what i've read. Apparently they're worth every penny.
Just about every after market stem is going to be stronger than stock. I'd find the best deal i could. I'd also go with +1 or even +2.
here's one that i had in mind
Burgard:
http://www.burgardcycle.com/xcart/pr...4&cat=1&page=1
200 bucks, great deal on a stem i'd say.
That and flex bars is what i think you should get. Just do your research and learn as much as you can. Go ahead and look up Flex bars on the forum and read what people have to say about them.