About the DTS connect function. It should not matter but it does however. When playing files that have a AC3 or DTS stream, it is possible to route that directly thru your reciever. However for all other audio streams it makes a huge difference. If you plan to route music with asio (no interference from windows mixer directly to your reciever you should not need dtsconnect. But since most recievers have a surround speakerset attached to it you will end up with stereo through only 2 little speakers, which sounds like talking into a can. I found the dts connect function extremely stable. It does a hell of a job up mixing the audio. (I'm picky). I use my HTPC for listening music, watching TV (digital) and watching full hd movies. I replaced most of my mp3 collection with ape or flac and it sounds really good with dts connect without fuss (mp3 also). TV signal, even though not always 5.1, sounds really good as well. If the signal is 5.1 it will passthru, if not it will make 5.1 very well. Most movies I watch already have 5.1 stream so limited use there.
conclusion if you plan on 2 big stereo speakers as part of your 5.1 speaker set I would go along with not needing DTS connect (it stil is nice) If not I would go for it. Consider p35-ds series for Mobo (intell)
Be aware though that in 3 or 4 months HDMI 1.3 audiocards will be available for 7.1 lossless audio formats. (DTSHD DDHD) This will degrade the value of dts connect. However price will be an issue. I can hardly wait
On the Plasma: I really do think you should consider FullHD (1920) Most videocards with directx10 do a excelent job of upscaling. I own a older gen Samsung 40 inch and I am really satisfied with watching tv. Mine is LCD though but Plasma is better for watching tv. A screen like that would be bought for at leqast 5 years. I do think you would regret watching blueray on 720p. this and 42 inch with only 1356 lines will show I think depending on your viewing distance.
I watch movies only in full hd and I just smile every time I turn it on (x264 1080p mkv files mostly).
The pixelmapping is not a big deal. You can correct this in the videocard settings by canceling the overscan (although nobody knows if compressing 5% by the videocard and overscanning 5% by the tv will give you the exact same pixels as with 1 :1 pixelmapping)
Hope this helps
