I use diacompe TT levers, which are in the same price neighborhood as the nashbars (although slightly more). I compared them to another brand they had in stock at Montano Velo, and the DC ones seemed slightly less chinsy. That being said, after I installed them, I realized the rivets that the levers are hinged on aren't extremely tight, and made a slight rattle when I rode. This annoyed the living piss out of me. I wound a little dental floss underneath the head of the rivet (between the head and the washer), the rattle went a way. You may find a similar problem with whichever you get.
The other thing I liked about the diacompe is that they are all black:
diacompes