Low end, cool CPE.

[jlewis at packetnexus.com (Jason Lewis)]

Everytime I'm in the market for a device like you describe, it comes
down to the limitations of consumer devices.  You can't get all those
things in a low cost solution.  I end up rolling my own.  My latest
system is this http://www.supermicro.com/products/system/1U/5015/SYS-5015A-PHF.cfm
, with Endian http://endian.com/en/community/download/ and an
additional dual port nic.  With all the parts (HD,NIC) it's under
$400.

It's an atom board, so you could put whatever you wanted on it.  I
have a 50mbps net connection and it doesn't have any issues.