I guess the first and primary piece of information we need to know is what's your camera? If it's a big 15-20 pound camcorder with a 5 pound battery hanging off the back of course that won't work well with a cheaper jib. But if it's a DSLR that's a whole different story.
We've been very happy with the Libec 30 and now 50 for both our big XDCam rig and for the much lighter Canon C-100. New the 50 is out of your stated range, but there's a Libec 30 on eBay right now for $849.99. BUT... (and it's a big but), this and other ones in its price range require that you have a decent tripod to set the jib on and a decent fluid head to move from the tripod to the end of the jib arm.
Hope this helps or at least starts to clarify what anyone else wants to chip in.