I just moved and was setting up a new home theater and bought a 51" Samsung plasma HDTV. I wanted a new build that I could use as a HTPC (big things I wanted were Blu-Ray playback and some decent storage) and also use to play some games on my new big TV.
I went with the A8-5600K because of the reviews that they can handle 1080 video capably on their own with out a discrete graphics card, being able to overclock a little for the light gaming I do and the price. I paired it with the Radeon HD 6670 as it is the highest card you can use the dual graphics feature of the APU.
I went with the SSD to boot and play games from since I don't play that many and I wouldn't be switching them out very often and the 1.5TB HDD is obviously for my media storage.
I went with the Fractal Design case as I wanted something with decent airflow to keep my HTPC cool and quiet while being unobtrusive and simple. Some minor notes about the case are that it is a tight fit for larger micro-ATX boards (I originally had gotten an MSI board that fit very well but was DOA and upgraded to the ASUS which was a tight squeeze), taller CPU coolers will not fit, USB ports and power/reset switches are on the side of the case no the front or top and the power LED is bright enough to blind you from about a mile away. I had some black duct tape that I cut a small square from and placed over the LED which dimmed it but is still very clearly visible.
Overall I have been very happy with the performance so far as it effortlessly play Blu-Rays and I can play Far Cry 3 (which came with the SSD) on Very High with no issues and Skyrim on High which is perfectly fine with me as I will be building a more dedicated gaming build in the near future that will probably go into this case and I will transfer the guts of this build into a Fractal Design Node.
For those who are building an HTPC I would recommend the Logitech K400 keyboard with it since it has a built in touch pad, is fairly small, and has a power button to put the computer to sleep/wake up (and it was $29.99 on Amazon with shipping). I wouldn't recommend it for gaming though, I just use a wireless 360 controller.