If you need a dirt-cheap, dependable motherboard, Computer Geeks Discount Outlet has a refurbished Asus M4N68T-M V2 available for under $34. It’s a socket AM3 board, so it uses readily available AMD Sempron/Athlon II/Phenom CPUs and up to 8 GB of DDR3 memory (and there’s little reason not to put the full 8 GB in–4 GB DIMMs cost $19). I’ve been running one of these boards since September or so and I’m thrilled with it.
You can build a nice 4-core system around this board, or, for a budget build, drop in a $40 Sempron and 4 GB of RAM for $19 to upgrade an aging system on the cheap, or build an affordable, low-power HTPC. A low-end Sempron will outperform an Atom while using less than 45 watts.
I spotted that this weekend, and thought you might like to know.