I am about to purchase a HR21 HD/DVR DIRECTV RECEIVER off of ebay and I have two questions. One is it says that the receiver is leased and I have to set that up with Directv, will this cost me any more money if I already have the HD package and am replacing a regular receiver with this HD one? Secondly is will the HR21 HD/DVR DIRECTV RECEIVER work with my 3 LNB dish most places selling it say you need the new slim-line 5 LNB? Any help would be great!