Indeed
here is the link for the advice asking template.
The basic concepts are that you need for most HTPC's anyway.
CPU: dual/triple core CPU: i3 2100, Athlon II X2/X3, A4 - A6 APU's.
MB: MiniITX, microATX that is supports your CPU.
Mem: 2x2GB works just fine, but it's so cheap that you can easily go 2x4GB
HDD: Usually 1TB minimum for storage
Optical: Bluray drive
Case: one that fits all your components and you like usually microATX and miniITX. Silent operation and good stable cooling is generally nice to have.
Affects the longevity of your system.
PSU: Depends heavily on the case, but if you can use regulars, the more efficient it is the less heat you produce and the less heat you produce the less noise it will make.
Also fanless options available. Low
GPU: The build in graphics for i3's and A4-A6 apu's are quite ok, but you will do better having a reasonable GPU.
Nvidia GT430 is pretty decent for the job, same with Radeon 5570/6570 series. They have enough juice for most post processing things as well.
Recommended one would be 6570. And it is pretty cheap.
Optional:
Possibly an SSD for boot drive 30 to 60GB
TV Tuner Card - you can get 4 tuner cable cards for 300-400, so up to that pretty much.
For Bluray movie playback SW such as PowerDVD 10/11 Ultra