For wheels, Velocity makes some great rims in 650b, which one you should choose depends on what kind of touring, weight carried, your weight, etc. For hubs, I really love White Industries, they are beautiful and durable. Phil Wood is another great choice but not as pretty IMHO although they are some of the easiest hubs to pull apart which is nice for side of the road repairs.

Drivetrain is a very personal choice, I love the way Sram shifters feel but Shimano is much easier to find around the world

Bars also are a very personal thing, I am assuming we are talking drop bars. I am getting a nice custom frame as well later this month and I will be running the Salsa Cowbell bar. If I was not already spending too much on the frame I really would like to try the Thompson bars but talk about spendy...

Almost forgot to mention, congrats on getting such a nice frame. Those Tomii frames look great