I have Diskkeeper 5 and Norton systemworks Pro 2001 on W2k.
(1) The Norton Utilities 2001 is good, but it is not worth the cost if you only want the speeddisk. The W2K defrag program runs slightly faster than the Norton, but lacks scheduling capacity.
(2) I am very impressed with the SystemWorks 2001, which includes the anti-virus, utilities, cleansweep, ghost and a light edition WinFax. It is listed for $99, but usually was sold close to the price of Norton Utilities alone.
(9) The Ghost 2001 is the best program for migrating to a new hard drive. Fast and totally painless.