We cut cable and now our bill is 19.99 for 12-15 mbps cable internet. I had to talk them down to it, but I'm not complaining. I'll probably go back to Netflix when they add HD streaming on PC's. How big is their streaming selection? I had it when they first started it and it was pretty lackluster. How new is their stuff?
It's not great, but there are several old movies on there that I can watch again and again (Shawshank Redemption being one) and I watched the first two seasons of Dexter on there before having to rent the third. You'll also get whatever is on Starz each month on Netflix, it was just announced everything Joss Whedon (Buffy, Firefly, Dollhouse etc) directed will be on there in full. Don't really know what your tastes are though.
In the end, you usually wind up watching a lot of horrible movies and finding the occasional gem you'd never heard of and they're getting better about bringing out newer movies faster. The Proposal is one that's been up for about a month and just came out last year.
Thing is, Netflix probably has the go-ahead to double its online library but like most sites, continues to release things slowly to keep people coming back.