I am looking for the best performing computer in the X series.
Which model should I buy, if that is my criteria?
That would be X201 with Intel Core i7-620M Processor (2.66GHz 3MBL3 1066MHz), 8 GB PC3-8500 DDR3 (2 DIMM), and SSD HDD.
Agreed: x201 w/ SSD. 8GB would be great *if* you like to have a *lot* of things running simultaneously. The fact is, with 4GB and an SSD you have less latency on the pagefile. (Also it saves you a few hundred bucks!)