I'm considering building a dedicated video caputure box for recording signals from cable and satilitte feeds. Among the hardware I'm considering is a 2.5 Ghz Celeron processor, ATI All In Wonder 9600 card with 128 MB Video memory onboard, and 512 MB of pc3200 DDR and a 400 Mhz FSB motherboard by aopen.
Are you specifically tied to an Intel platform? AMD offers considerably more bang-for-the-buck than either the badly-crippled (cache-starved) Celeron or the P4. You can use the money you save to purchase better audio/video capture hardware or fancier software.