the only test which gives somewhat meaningful results may be HDTach...i think it's a pretty good benchmark.
Sisoft Sandra MAY be used in case you want to compare your drive's (better: Filesystem's!) performance to other setups within a "real life" windows environment - however it depends heavily on the amount of diskcache used so the numbers you get with windows/diskcache on are more or less useless.
HDTach does tests of the raw HD performance, it measures a kinda accurate average access time and the burst rate (from your controller to the HD, to test if ATA100 works ok etc...)...it also shows your CPU usage.