This is the build I built for myself for $300. It cannot fit a TV tuner or wireless, its only for pure playback only:
- Antec ISK 300 w/ 95w adapter
- 4GB KVR 1333MHz, auto downclocked to 1066MHz
- Gigabyte H61N-USB3
- Samsung 830 64GB
- Intel G540
- Win 8 Pro for $15.
If you want a TV tuner and all the trimmings you need an mATX case, an mATX/ATX board and an i3.
I'm confused, my original question was what I would need to make an HTPC on windows 8, not a regular computer. I already know how to make make a regular computer, but thanks for the input anyways.