Everything looks good, but I would strongly advise you get a better graphics card. This will be the key in driving your media along with the tuner which you have.
I recommend these cards:
Radeon X1300 (X1550) only because it supports the ATI AVIVO video technology. I believe it makes a difference in picture quality. As long as you get the X1000 series of cards, they support AVIVO. http://www.newegg.com/Product/Product.asp?Item=N82E16814102081
I know it costs a little more, but this is just my suggestion.
yes gfx, i would not go below 6200. you will feel and see the difference and they are only
10-15 bucks more. thats absolute min for me. i also would get a large hdd if you are on planning on recording tv. it easly adds up.
do you already have mce? good stuff too, or vista's mc if you ultimate or premium.
beyond tv is also good and as a free version they have media portal (2 i believe) at sourceforge.net
i also use the ms wireless mouse and keyboard with it. nice toys, the remote works well