Buy the pieces separately. A tent is less than $200 (Lighthouse Hydro is what I use), a decent 600w dimmable with both HPS and MH, with cooltube should be $150-$200, carbon filter & fan (440CFM 6") $150-$200. That's under $600. Now just add accessories... pH/PPM meters, medium, pots, nutrients etc. After all that, you'll still have money left over for incidentals.
-spek