Here is an As SSD for my WD1002FAEX 1TB sata 6GB/s mechanical hard drive
Here is the same test on my Intel 80GB X25 M
For an OS drive the advertised speeds really mean nothing to the average user unless you are going to be transferring large files all day. The most important thing is access time- how long it takes from the time you push the button until the application actually opens. No spinning circles with a good SSD.