Where to buy Steering Gear boxes (power)?

I know there's Firm Feel, and I know there's the $100 Parts-Store boxes, but is there any intermediary, say at like $200? I just don't know whether I need a Firm Feel box, but I have heard bad things about the parts store boxes. Thanks!

I recommend Steer n Gear. I didn't like my parts store box-it had mis matched components and steered "twitchy"