Sweetwater.com has a nice buyers guide to review - and they do a good job explaining features: http://www.sweetwater.com/shop/keyboards/keyboard-controllers/buying-guide.php
They also will sell you gear too. Brands that would seem to fit your criteria are CME (their M-Key controller), or M-Audio (Key-Rig or Oxygen).
Sliders and knobs on a controller can be mapped to control elements of your recording software so don't completely discount those features.
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http://www.sweetwater.com/shop/keyboards/keyboard-controllers/buying-guide.php
They also will sell you gear too. Brands that would seem to fit your criteria are CME (their M-Key controller), or M-Audio (Key-Rig or Oxygen).
Sliders and knobs on a controller can be mapped to control elements of your recording software so don't completely discount those features.