Well heres what i came up with:
https://secure.newegg.com/WishList/MySavedWishDetail.aspx?ID=8467485
Vista home premium x64 would be $99 vs $139 for xp pro 64bit, just to keep that in mind(put xp in the build since you said thats what you wanted), vista would have a better ease of finding 64 bit drivers though. Also, with Core i7 you will want 64bit as its tri channel, so 3gb and 6gb are the common memory configurations.
Basically this is whats in the wishlist:
-Vista compatible tv Tuner
-Evga X58 Mobo
-6gb Corsair DDR3-1600
-Gtx 260 Core 216 55nm Edition
-Core i7 920 Quad Core
-Asus 1920x1080 Monitoe (1080p HD with hdmi also) 21.5" Monitor(listed under the 22" monitors on newegg, but trust me .5" is not that much of a difference).
-Coolermaster V8 Cpu Cooler
-1TB Seagate Barracuda 32mb Cache SATAII
-950 Watt Coolmax Power Supply
-LG Dvd Burner with lightscribe
-NZXT Tempest, not sure on your tastes as far as cases, but at $109 its about middle ground as far as the price on mid tower cases(Kinda a placeholder, i love the tempest case, you might not).
That should give you someplace to start, grand total comes to $1,969.89 before rebates.