the original Digi TCE is actually pretty decent. Timeshift can work...just make sure your settings are right.
Speed is worthless.
X-Form is really the way to go as far as Digi products
http://www.digidesign.com/index.cfm?...=1&itemid=4954
Waves Sound Shifter is also pretty darn good.
Me? i use X-form, but usually the Sample Rate Convert speed trick. not artifacty at all. then pitch if i need to.