Pretty much any HDTV with multiple HDMI inputs will get you what you want. Connect your DVD/Blu-Ray/Set top box via HDMI. Connect your PC to the HDTV using a DVI --> HDMI cable like this one
Check your graphics card to see if it can send audio out over DVI (it would have a 2-pin audio port on the card). If it does, connect that to your motherboard's audio port. If not, you'll need to run audio to the HDTV another way.