Here is an interesting Dual LGA 2011 board. The Intel S2600CP2J for $175. Pair that with some of those cheap E5-2670 chips and you have a pretty good base setup for a budget boincer.
I think this power supply with a power distribution board could handle it with no trouble.
Having trouble finding DDR3-1600 memory that isn't expensive. With 32 GB of memory, a decent CPU cooler and SSD, that would be a nice setup!