I plan on upgrading my 500GB 7200RPM Seagate to a 512GB SSD, but I am not sure whether I should go with the latest or the moderate and stable SSD. Price is not an issue. I have narrowed it down to the OCZ Vertex 4 and the Crucial M4. I know that the controller on the OCZ is much better than the previous OCZ models, but after reading various forums it seems that overall users say to go with the older and slower Crucial than the faster and newer OCZ. I need to run several VMs as the W520 is my main machine. What do you guys think?