I eventually decided that running a homebrew remote-controlled PC in the living room was just too risky, and given that it was something of an open-ended project I wasn't sure I had the time to pull it off anyway. Something like the MiniDSP UDIO-8 would fit the bill, but it only supports coax inputs and of course everything I have in the living room is toslink. Plus, if you need to support external inputs you'd either need to use analog inputs or else SRC on the digital inputs since the jackd/BruteFIR setup will only run at a fixed sample rate. I think it should be feasible to come up with a minimalist 'appliance' style solution where you power-on straight into audio processing, but getting volume control, input switching etc would need a bit of coding at least, and probably a lot of testing. I was weighing between the SHD and a PC-based solution using jackd/BruteFIR on a linux box. It does have a trigger output though - something that IMHO is a disappointing omission from the SHD. BluOS streaming which I know very little about. At the time of purchase (like 2 mts ago) I read better reviews on it. So i bought this Dayton Audio mic for absolutely nothing. (and the low-pass outputs are almost certainly limited to a single fixed slope and probably limited to 200Hz or lower based on my experience with the D7050). I found out that you cannot use MiniDSP's Dirac version with anything other than their UMIK-1 mic. More expensive, and missing the generalized DSP functionality though.
MINIDSP DIRAC LIVE REVIEW FULL
The NAD C658 is the closest off-the-shelf competitor I think - has Dirac Live (limited version, upgradeable to the full version), and has stereo low-pass outputs potentially suitable for bi-amping. My application is to bi-amp with a 250Hz (ish) xover between monitor tops and woofer cabinets in our living room which requires at least a couple external inputs in addition to music streaming and has to be wife-friendly. I have an SHD on the way - should be here today - so I guess my answer has to be 'there really isn't one' depending on what you're looking for.