To the best of my knowledge both the Mitsubishi HS-HD2000U and the JVC HM DH3000U can only recieve 1080i digital HD via IEEE 1394 fire wire. The Mitsubishi HS-HD2000U can only send via IEEE 1394 fire wire. The JVC DH3000U is equiped with an MPEG encoder/decoder which can upconvert analog signals to digital to record in the digital domain and output via HD analog component output. I'm guessing the JVC's MPEG decoder is MPEG2 and I don't know how it will interface with some of the newer MPEG 4 systems. I believe some of the newer JVC machines may be more flexible, but, I'm not sure. Unless one gets into some esoteric computer based equipment, I believe the only way to record in pure digital HD with either of these machines is via IEEE 1394 fire wire. This IEEE 1394 fire wire is only capable of connecting with specific applications.
If the HD Dishnetwork has an appropriate IEEE 1394 fire wire outlet, your probably in luck, if not, your probably out of luck.
I suspect the powers that be, arranged this mess to protect their "intellectual property". You know, reality shows and the like.