In January I replaced a 5 year old PC with an A10-5800 and an Asrock motherboard.
The A10 is almost certainly more than you will want or need. I went that route because I enjoy emulator games, using Plex to transcode in real-time to my phone, and wanted to compress some recordings and rips.
The Asrock motherboard was around $75 or $80 as was very easy to set up. It was my first time with an AMD processor and ATI graphics so I was afraid there would be more of a learning curve. Though the color setup was harder for me to tweak, the bios was so much easier than I was expecting.
Only downside to that board was that the esata port does not support port multiplier. I assumed (wrongly I now know) that all newer motherboards did that.
I went with the A6-5400k and after a bit of tweaking, I can play my movies with madvr, smooth motion (since my tv is old and doesn't support 24p), and 3dluts for calibration. It was really inexpensive, and a huge upgrade from my Pivos Aios.