Most of my bikes end up with either North Road bars or plain riser bars. My main fixie has 5" risers right now for a fairly upright position. They're just plain cheap chrome steel, look kinda like low BMX bar without the crossbar. I've ridden up to 15 mi on them and they're pretty comfy. I also use fat cheap foam grips.

North Road bars are also nice and have a significant sweep back. I finds the hand position on North Road bars to be very "natural" feeling. Either bar I mention can usually be found for less than $10 in steel. Cheap enough for a worthwhile experiment. More $$$ in aluminum. BTW, North Road bars are pretty similar to the Rivendell albatross or dove bars, the same shape as on old three speed english roadsters. The Nittos are undoubtedly nice. However, I use Wald (cheap American steel) and Pyramid (cheaper Asian steel).

One thing to consider, the more upright you ride, them more weight on your butt. Meaning you may want a wider (or at least different) saddle.