The RPM of a hard drive does not have a direct connection to the maximum data transfer rate that it is capable of. The rpm directly affects the access time, particularly the rotational delay component. The data transfer rate is better on drives that have denser platters, and the rate is better on the outer cylinders of the drives where more data is stored per track.
www.storagereview.com has some benchmarks of maximum sustained data transfer rates of several drives:
http://www.storagereview.com/php/benchmark/bench_sort.php
Of the drives tested, the seagate cheetah 15k.5 is tops at 135mb/sec a 15k drive
the 300gb velociraptor is second at 127.0 a 10k drive.
The hitachi deskstar e7k1000 is third at 121. I think it is a 7200rpm drive.