There's always the standard porteur rack from VO, $145-160: http://www.velo-orange.com/racks.html. I think Leah's Rack Lady racks are amazing, and at ~$200 for a custom rack, an amazing deal as well (and I don't think she's hurting for business). For off-the-shelf, I'd probably go with the Pass and Stow. I didn't know the ANT racks were being sold separately from bike builds again, but I'm sure he's charging well north of $200 for those. As vegenaise mentions, good racks may seem pricey, but I think they're worth it, if you rely on them a lot and to carry a lot. A couple of things to note regarding quality is how well the struts are triangulated to the platform, and how/where the platform attaches to the frame.

Good luck with your search!