Found an interesting upcoming single-board computer (SBC) with quad-core Krait @ 1.7Ghz and Adreno 320. At $149, it looks interesting. Still only in -pre-order though. Might get one if the software support is right. Have been burnt before with devboards with interesting hardware but crap drivers so will wait and watch for now. Particularly interested to see if it supports OpenCL, and whether OS options include fully-supported Linux and not just Android.
Link: http://www.inforcecomputing.com/product/moreinfo/ifc6410.html
Update: The company confirmed that the board supports OpenCL on GPU! Currently they have an Android image based on Jelly Bean 4.1.2. Linux seems to be on the roadmap but no ETA I believe.