+1 for the miniDSP SHD Studio. It's very flexible and has a lot of functionality in addition to PEQ and Dirac Live. I don't think you can beat it in terms of bang for your buck.
A couple of more expensive options are the Trinnov ST2-HiFi or DEQX PreMate.
A couple of more expensive options are the Trinnov ST2-HiFi or DEQX PreMate.