CURRENT RECOMMENDS FOR BUDGETTING OF A HOME THEATER PC. Just to note: yes, you can run a HTPC on much less, but I consider that in order to be a HTPC, the following standards must be met:
1.Must provide HDMI connectivity.
2.Must output 1080P and support DXVA hardware acceleration of HD Formats
3.Must output at least DD/DTS Core formats.
4.All of these also list assume the basic $29 Microsoft Media Center Remote Control.
BASIC: $500 OR LESS
AMD 880G: A reliable HDMI output ready motherboard which supports DXVA, full HD, and DTS/DD core over HDMI. Also onboard 8 channel audio for LPCM decoding if preferred. $65.
AMD X2-250 Dual Core CPU: Dual core is more then enough to decode all of your movies, video, and content without ever feeling slow. It also gives you enough "oomph" to do basic recoding in the background. $60.
2GB DDR 2 Memory (many brands/types/etc.) normally available for about $25
500GB SATA: (many types) $44
Standard DVDRW: $22
Case: Silverstone GD4: http://www.newegg.com/Product/Product.aspx?Item=N82E16811163158&cm_re=micro_atx_htpc-_-11-163-158-_-Product ($99) Great case, available in many places has great look and works.
Power Supply: HEC base ATX: $22.00
Windows 7 Home Premium 32 or 64bit: $99
This is your cheapest option AT THIS POINT that I would recommend.
Next: Super-Mini
AMD has upped the ballgame with its new super-mini for HTPC. That's the AMD Zacate. Using about 18W of energy, this is a low power unit that passes DTS-MA/DD-HD or LPCM over HDMI. Single board with processor in a MicroATX Format can be found for around $130. This accomplishes everything and does it with so low of power usage that it's definitely a strong consider. If you are looking for something super cheap + energy efficient + 1080P ready then this may be the right solution.
Stepping Up: The Full Monty HTPC
If you're going to spend on HTPC, you're either going to get a seperated video card (I recommend the ATI 5770 or up) or you'll look at this solution. That's Intel's Sandy Bridge. Now that Intel has fixed their issues with chipset, a 2400K (K is IMPORTANT here, it's the difference between HD2000 and HD3000 video).
Using a 2400K Processor plus H65/H67 board, you get: DTS-MA, DD-HD, LPCM output over HDMI, Hardware accelerated 3D BD support, and normally enough slots to handle your media cards and components. Keep your other configurations basically in line (4 Gig of RAM and 500GB should be the baseline, more if you are going to save a lot of TV, a lot more if you don't plan on using a NAS or WHS)
This week I'm going to go through the build outs on an AMD Zacate plus the build on an Intel :)
THIS LIST IS UPDATED 4/2/2011