Hope you guys are still looking at this thread.
Anyway, here goes my two cents......
I have used:
Hauppage PVR-150 and Hauppage HVR-1600.
ATI TV Wonder™ HD 650 Combo USB for PC
Pinnacle PCTV to go HD Wireless
Slingbox Pro HD
The PVR-150 gave me less hassles than anything else. It is an analog tv tuner and will be useless next year due to the digital transition. It will work great with regular cable subscription.
The HVR-1600. This is an analog in and a ATSC in. ATSC is attenae. Never got it to work on digital cable. Some people claimed they have though. When i tried to plug the cable in for the ATSC to my regular cable out of the wall it popped the digital part right out. kapooey.
ATI 650 worked really well with the cable in and the video stereo from the cable set top box. The draw back was that i could not intigrate it into my cable set top box that well. No true HD from the set top box....only from the regular cable wire.
Pinnacle PCTV To Go HD Wireless. Worked very well with Cable in and the set top box. Sharpest picture i have ever had. Only draw back was that PCTV to Go only can receive stereo (red/white) audio from the set top box. No 5.1 surround sound in from the box, only from the cable in. Also works great for ATSC/QAM and Analog.
Sling Box Pro HD. I just bought it Friday and installed it Saturday. Worked very well with the Sling Player Software it came with. Tried using it on Vista media Center....NO GO. It would not work. even after all of the write ups said it would. I found out i was duped in that. I wanted the Sling Box because it had the orange coaxial audio SPDIF...AKA 5.1 surround sound.
Out of all of the ones I have used Slingbox was the only one that did not work with media center.
I should have went with Hava at
http://www.myhava.com/index.html or stuck with my Pinnacle and waited.
Hauppauge has an HD PVR but it is not media center compatable either.
Good luck.