Mushkin now introduces the Catalyst Cache solid state drive. It's in fact an optional 50 or 100 GB SSD intended just for caching. Combined with Dataplex cache application software and your own HDD, the combination could be just what you have been looking for.
Mushkin offers their dual-channel Blackline Ridgeback in 8GB kits at $125 (USD), and to spice that up .. it is offered as a 2000 MHz kit, with granted not the most sexy timings but at a CAS latency of 9 versus 2000 MHz versus two 4GB high-density DDR3 modules. At 125 USD , and that's 15.6 USD per GB, you can understand that this kit might be a nice alternative to low latency 1333 and 1600 MHz kits. Muskin even tops that off by a lifetime warranty on this product so all in all that can't be a bad deal, no Sir.