When I first built the Xtracycle, I was running regular straight mountain bike bars. I was noticing a lot of wrist pain after spending even a small amount of time on the bike. And living in a sprawled out area, I was spending up to 30 miles a day in the saddle. At one point, it hit me that these bars were different than anything I'd been running on my other bikes... and they were causing the problem.
After some research and thought, I decided to go with something that would put me a little more upright and turn my wrists in just the slightest bit. I came across enough literature in favor of the Nitto North Road bars that it was nearly a no-brainer. I did toss around the idea of the Nitto Albatross for a while, but went with the North Roads because they weren't as wide. At 5'7" tall, I don't have an incredibly large wingspan.
Get out there.