With my Abit KT7 RAID, and 2x IBM 30,7 GB, I just got 43215 points in Sandra. This is in Win2k. I remember getting as most 26000 with a single drive, but this was on a very fresh installation - after all proggies were installed, and a couple of weeks downloading/moving stuff and so on with no defrags, it was at most at 24000. Same with my present RAID setup, which I set up 3 weeks ago: scores were about 5 % higher on the clean installation.
Edit: this is in RAID 0, of course.