I have helped a friend connect his Mits-Hr400 (I think same as the E86) to the 503CMX. It worked great very easy to use and great remote. I think with $400 for receiver + 3 lnb dish is reasonable.
You should get the 3 lnb dish cause you will be able to get the 3 direct tv sats
You should get the 3 lnb dish cause you will be able to get the 3 direct tv sats