If you get the Nashbar OS bullhorns just note that they extension on those things are REALLY long which may be why some people are suggesting a shorter stem. I got Proifile T2 Wings because they are much shorter and fit me better. I did previously purchase the Nashbar bullhorns. I have a 54cm Langster and run bullhorns and a 120mm stem. Fits me perfect. I also run a 120mm stem on my road bike with standard drop bars. The position on my hoods places me in the same approximate position as the bullhorns if that helps you make a decision.

I did a comparo between the two:
http://bikeforums.net/showthread.php?t=294716