Gaara can beat any jounin, except the ones who have names...
Gaara won't win against Gai, Kakashi, Asume or Baki, but will win against 'random jounin #1, #2, #3'
the only named jounins he has a chance at beating are Raido, Genma, Hyate (dead) and perhaps Shizune and Shikamaru's dad...

looking at that, he has a chance at beating a shitload of jounins...

oh, and current Naruto\Sasuke\Neji can do the same, give or take a jounin...