actually, the figures i saw, the wd1000jb(100gig) was approx. 2 mg/sec off the first place cheetah15k. the atlas 10k was third, but i really think it wud be a tad faster than the ide drive.
and yes, they do come in 100 and 120 gig versions.
and the ibm drives are all built on the same basic principle, and the heat killed the 70's. But theoretically it is possible on any of the gxp drives.