Consensus suggests Wasim - I am glad, there have been none IMO as good as him. Not only could he bowl Yorkers almost at will, he could swing them in and control his line on a yoyo.
McGrath and Pollock - not good enough at Yorkers.
Harvey - massively overrated. Yorker very good but he can't bowl it nearly as often as some seem to think. Slower ball just a hit-me at that stage, for any bowler.
Kumble -
Kumble's a great one-day bowler but I'd prefer him to bowl 20-22-24-26-28-30-32-34-36-38 straight through anyday. Like Pollock and McGrath, he's too much of a metronome (hits a length by habit rather than by aim, so finds it hard to bowl Yorkers instead of conventional good-length).
Lee -
Lee's control's so poor most of the time he's worthless any time.
Never knew L****n was a death bowler - he and Austin are two who you'd think would be best in the same period as Kumble, but both evidently made careers out of bowling at the worst time possible and still ended with econs under 4 (L****n in ODIs too). I loved L****n as a bowler - everything you'd want in a one-day game.
Gayle - brilliant sometimes, terrible others.
Kallis - not been anywhere near as good since 2001 as he was before that. Before that, there were few better.
Gough - been excellent for most of his career, wasn't so good in the 2000\01-2001\02 time, but aside from that, excellent.
Stephen Waugh was good ages ago, too.
I agree with Corey that the best pace to bowl at is 60-70 mph, and that also gives you a better chance of controlling it perfectly. Most importantly, though, no flight.
Whatever pace, though, most important is hitting the creaseline every ball. Low Full-Tosses are asking for the treatment (though they don't, always, get it) and Half-Volleys are easy for any decent player to put away.
Also vital to get the right field. If you're bowling to order, you don't need a deep-extra-cover; a fine-leg, however, is vital at all times.