I know Jeff Laurence speaks highly of the AirCorp stuff, but not terribly highly of the Aphex box. As a recall, he thought the preamp was a bit harsh and the gate was a little stiff. What I've heard of the Aphex didn't thrill me either. It sounded very "radio" to me, rather than clean and natural.
Around that same price range, is the Focusrite Voicemaster Pro, which I use. I don't think it will take the abuse that the AirCorp will, but I love the sound. Great preamp, great compressor and expander. The EQ isn't very well featured, but what's there sounds great too. Something to consider if you keep your rack caged off from drifting fingers.
Emmett