Whats wrong with having an HTPC version? Theres plenty of people that want a small set top HTPC they can throw on the shelf next to the cable box and the playstation that can record, edit and playback the shows they watch.
If you want that currently you are looking at a box that will have to be parted out and assembled yourself, will more then likely not work 100% with Linux and not be sending any money back to any Linux or OSS teams.
The reason I ask about adding the DSP is because XvBA doesn't really work and only works with the FGLRX drivers, the DSP allows for offloading of video decode for pretty much every common codec, bitrate and resolution, only the oddball DVD rips you torrent will likely exceed it's capabilities. the E-450's CPU should be enough to handle lower quality real time transcodes, but not while also playing something back, if OpenCL over both the CPU and GPU picks up steam and we get a video transcoder written to use it that will quickly change.
And it's not like these DSPs are big anyways, they fit on a laptop MiniPCIe card, same as a laptop wireless card.
Furthermore the DSP could eventually become a Co-processor if the rumors about what AMD is doing with OpenCL and their Heterogeneous Computing initiative are true.
This is actually stuff I've bugged System76 and Zareason about for some time now.