The thing is can you really match the image quality. I have Tivo HD, and I send all my video through a DVDO Duo. So far at least the caliber of video coming out of an HD5450 just does not compare to what can be done with Tivo to the Duo. I run the Tivo in native so the scaler in the Duo can do all the deinterlacing and scaling. I know people on this thread are big on video out of PCs but I just don't get the same results out of TV from the PC. I will grant that blu-rays look okay, so it must be codecs somehow.
I am sure there must be some combination of settings that should match but it seems pretty difficult to match.
BTW the tuners are also pretty poor in general. I have a couple of HDHR and I give them a 6 on capability as tuners, the Tivo is an 8, a cheap Samsung set top box the DTB-H260F would be a 9.5.. The Sammy does a great job as tuner, too bad it won't send native resolutions because the scaling is kind of horrid. The Tivo finds and locks to station the Silicon Dust tuners give nothing black, the Sammy locks and find station that are only black on the Tivo HD.
I have a bunch of PC tuners around, and the flexibility they provide is nice, I just remain unconvinced with their signal grabbing abilities and getting the video quality out of them is also a question mark.
Samsung 78" JS8600, Mits WD-92840 43" Samsung 43ku7000 - Lumagen Radiance XS, Martin Logan Motion 40s, Ascend Sierra 2s
58" Panny Plasma -DVDO DUO, Usher S520, JBL HLS-610, Definitive SM45, MusicHall Marimba