Does anyone have any recommendations for a good ATI video card to handle blu ray and blu ray 3D playback, little or no gaming and streaming web based content in the $75-100 range? It will output to a large screen DLP tv.
The 5670 is more of an intro level gaming card. For your needs a 5570 or 5550 is a better fit. Of course, you may need a half height card if you go with a smaller HTPC case, but if you can use a full height card then you may want to get one with a big silent fanless cooler
Yeah, the HD5670 is the lowest card that can effectively do vector adaptive deinterlacing with smooth playback enabled. This is only really necessary for interlaced content, especially if that content has diagonal lines (think white lines on a football field at 1080i). Progressive sources won't make any difference.
If the OP does go for an HD5670, the HIS HD5670 with the IceQ heatsink should be at the top of the list since it is dead quiet.