I'm planning to get Directv very soon, with an HD DVR. I just found out that I can get my own dvr without buying from Directv. One person suggested that I get the hd receiver from Directv, and purchase my own hd dvr. I'm new to all this. What should I do? What should I look for? which hd dvrs are reliable. Do they work with Directv? Please help a newbee out, (preferably without jargon). Thanks.