I have been reading a little about the Dish Network Model 6000 receiver and find myself getting excited about the prospect of receiving High Definition signals for my HDTV-ready Mitsubishi RPTV. Question 1: Where is the cheapest source for purchasing the Model 6000 receiver? I have done some cursory searches and have seen them for around $500 on average. If anyone knows of a killer source of receivers, I would be indebted to you. Question 2: Would I still need to purchase a set top receiver to translate the signals to my television or does the Model 6000 have a built in decoder for HD signals? Question 3: Would I need to replace my Model 501 receiver with the 6000, or do they work in conjunction with one another? Thanks in advance for your help. I look forward to your answers.