I bit the bullet a couple of weeks ago and bought a 42" plasma screen TV to us as a computer monitor.  
I was originally going to go with the multi screen setup, but after posting a question on this board, and finding out how the ones using large screen TV's as monitors liked it, I decided to give it a shot.  I figure worse case scenario would be that it wouldn't work and I would just move the TV to the bedroom to replace the old one, and then go with the multi screen setup.
Using the TV as a monitor is beyond my expectations.  It is absolutely great.  It's like a new game.  I don't think it will make me a better pilot, but dying is a lot neater.
My question is this.  I want to use the TV speakers for sound.  I only have on-board sound, so I guess I need to get a sound card.  My question is, what do I look for in a sound card that can be hooked up to the TV?  Does anyone have any recommendations for a sound card?
Thanks,
Fred
Below is my system and display information.   
System Information
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   Operating System: Windows Vista™ Home Premium (6.0, Build 6002) Service Pack 2 (6002.vistasp2_gdr.090803-2339)
           Language: English (Regional Setting: English)
System Manufacturer: OEM
       System Model: OEM
               BIOS: Phoenix - AwardBIOS v6.00PG
          Processor: Intel(R) Core(TM) i7 CPU         920  @ 2.67GHz (2 CPUs), ~2.7GHz
             Memory: 3062MB RAM
          Page File: 716MB used, 5611MB available
        Windows Dir: C:\Windows
    DirectX Version: DirectX 11
DX Setup Parameters: Not found
     DxDiag Version: 7.00.6002.18107 32bit Unicode
Display Devices
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        Card name: NVIDIA GeForce GTX 260
     Manufacturer: NVIDIA
        Chip type: GeForce GTX 260
         DAC type: Integrated RAMDAC
       Device Key: Enum\PCI\VEN_10DE&DEV_05E2&SUBSYS_12573842&REV_A1
   Display Memory: 2154 MB
 Dedicated Memory: 879 MB
    Shared Memory: 1275 MB
     Current Mode: 1804 x 1014 (32 bit) (59Hz)
          Monitor: Generic PnP Monitor
      Driver Name: nvd3dum.dll,nvwgf2um.dll,nvwgf2um.dll
   Driver Version: 8.17.0011.9562 (English)
      DDI Version: 10
   BGRA Supported: Yes
Driver Attributes: Final Retail
 Driver Date/Size: 11/20/2009 20:34:54, 9333352 bytes
      WHQL Logo'd: Yes
  WHQL Date Stamp: