For that price range, you have OME(old man emu/arb), Nisstec adjustable coilovers, and Radflo or Sway-away for the front. Nisstec and PRG are the most well known vendors for all of those products. And you can get either Add A Leaf rear springs that will stiffen up th soft rear springs, and/or lift shackles. Plus a variety of rear shocks.
OME is cheapest, appx 1.5" lift and you can get just the front or a full kit. I have it up front and it's a decent setup, not top of the line but good improvement over stock.
No experience with Nisstec coilovers, but they are built off Bilstein 5100 shocks.
SwayAWay and Radflo, but at a higher price point. Better performance, though.