You will. Any 7200 RPM drive will score around a 5.9 on WEI. My Intel 40 GB SSD fluxctuates between 6.3 and 6.9 on WEI.
Remember that the interface is SATA III but the actual drive is still operating well under that. SATA III elimates a future data bottleneck, but your hard drive is still far below that cap.
I'm glad to see it all worked out for you. If this issue has been resolved please mark this thread as solved.