Not to sound contrary, because I love and review movies on Blu-ray and I believe BD's picture and sound quality are definitely superior to anything cable or satellite have to offer. However, be aware that there are many people with high-definition televisions who prefer digitally shot TV programs not for their absolute object delineation but for their cleanness, their lack of noticeable grain.
To me, there is little reason why a person who can afford a high-def television set couldn't divide his money for content between an HD premium cable or satellite broadcast and a few well-chosen, well-loved BD movies for purchase or rental. I understand the OP wants to rent through one service or another only, but, again to me, it does not seem like a person has to subscribe to every premium channel there is, nor does he have to buy or rent every movie that appears on Blu-ray. A little compromise may be in order: one or two premium channels and a cheap Blu-ray player (I just saw Panasonic BD players at Costco for $230 and Sharp BD players for $199, plus Sylvania BD players at Wal-Mart for $169).