Until recently, the best upgrade you could give your PC was a RAM memory upgrade. Memory makes a dramatic difference in how your Windows and Macintosh machine perform.
Memory the last three years has become cheaper and cheaper and so adding memory, an easy-to-do-process can provide low-cost power to many machines built when big ram modules were only slightly cheaper than industrial diamonds.
One of the best sources of information on the best solid state drives, plus tons of information to help you understand this amazing emerging technology is a site calle Best Solid State Drives of 2012.