There are plenty of options. Race worthy is a broad, hard to define category. For instance, I raced my Karate Monkey a couple of weeks ago so in my book - it's race worthy
and race proven.
Take a look at Ebay, classifieds, here etc. El Mariachi, Karate Monkey, Singular Swift, Haro Mary, Niner SIR and MCR, Fisher Ferrous, KHS, Jamis, Raleigh XXIX, Soma, Vassago all come to mind.
You don't mention SS or not, so I'll assume geared. Fisher, by far, rules the roost down here in South Florida for 29ers and racing, followed closely by Pivot 429s. Rigs and Jabberwocky's dominate the SS classes with a few hapless KM's or KHSs or Felt 9 solo's in the mix.