Which Geforce do you have.
I have a similar system that you are talking about. I don't know other products very well for I only have experience with what I have. So I can let you in on that.
I have a Vizio 37" 780 LCD with HDMI inputs. A Fatal1ty 8500gt video card hooked up digital to HDMI. For DVD i have a Sony DVD burner, and for watching Direct TV or capturing video from a cam-corder I have a TV Tuner 650 PCI card made by ATI or Vision Tech.
My DVD quality is as good as it gets. The Satellite quality looks like I recorded a show on VHS and am rewatching it. But in saying that. I do not have a digital TV tuner card.
If you have a 1080 TV may check into a blu-ray player. This is the cheapest I have found. And it has Good reviews.http://www.newegg.co...N82E16827106225
For a Tv Tuner card ATI makes better cards than what I have. They have digital tuners, and from what I hear
Hauppauge makes good Tuner cards as well. I don't know if there is a card out there that will get flawless reception compared to your current receiver. But I am sure there are tons of reviews and probably video reviews on www.youtube.com.
Last you'll need a pretty decent size hard drive if you plan to record a lot. I have a Seagate barracuda 320 gig.
I really like them and the software for image restoration that came with it. I think a 500 gig is about $125 from walmart.