At $800 for RAM, I'd probably just get a new server with more expansion options. Keep all the same stuff except get a new motherboard, RAM, and processor. $380 (LGA 2011 dual socket)+$200(Quad Core Processor, E2603)+ $120(16GBX2 (2x8GB)=32GB of RAM, 8 RAM slots) = $820. Same price. Except you have way more expansion options. Again, this is only if 32GB is necessary. 4 more RAM slots and an extra processor slot as well as PCI-E 3.0 slots.
If it were me, I'd probably spend a few hundred extra and get a 6 core (E5-2620) and a mobo with 16 RAM slots. Again, only if necessary. As a side note, there are 24 RAM slot LGA 2011 dual socket motherboards available designed by Intel themselves as well as Tyan. Keep in mind all of these boards were designed with virtualization in mind. That's you see these crazy RAM capacities.