sminlal :
The "Windows Experience Index" is a very coarse guide to performance. In Vista the maximum score was 5.9, but in Windows 7 they expanded the range to account for new technologies (specifically: SSDs). You basically can't get a score higher than 5.9 for a hard drive.
If you really, really want to have a system with a score higher than 5.9 then you're going to need to get an SSD. But you shouldn't really base those kinds of decisions on the WEI score, instead you should ask yourself if the system is performing satisfactorily for the things that you use it for. If not, then you should identify which component is the bottleneck and look to upgrade that.
Now, THAT I call a really helpful response.
I had come to a similar conclusion, chasing other threads for what one could expect out of the VR, and found one which was using HDTune, which I am pleased to say will run under W7x64. My system disk performance was pretty much the same as another poster.
I get what you say about SSD, but what could I expect if I set up RAID0, certainly improved performance, but perhaps halfway between 5.9 and SSD rating?
I bought another VR to set up RAID0 for my system disk, but I have decided not to got down that route, as I had a W7 BSOD (another long story) and had a LOT of trouble getting my system back, it would have been so much worse, I think, if I had two disks in RAID0.