Or a used Rocktron Replifex or Intellifex. If you like ambience and chorus more go with the Intellifex. If phasign, flanging, tremelo, pan, and a really decent rotary sim are more improtant to you, the replifex is the better one.
Its tough to say in that price range. Ive never tried the GMajor but like all the units ive used some do certain things better then others. Even the Lexicon MPXG2 ($1k) has weaknesses. Theres better sounding patches on a Replifex for certain types of sounds.
Theres also the Boss VF-1. At half a rack space its a decent bargain. More different types of effects then any unit Ive tried.