Just to throw another wrinkle into the discussion, I noticed no one has mentioned the addition of high pressure coolant. I've seen some amazing displays drilling stainless steel with coolant thru drills on a Mori machining center. 70 - 7/16 holes to a 3" depth in under 3 minutes with the use of high pressure coolant.
Normally when you try beefing up speeds and feeds your common flood coolant isn't enough to keep heat from being generated at the cutting edge. The heat contributes to premature breakdown of the coatings or material of the cutting tool. High pressure coolant breaks through the vapor barrier created at the contact point of the cutting tool and the material allowing the tool to stay cool. This allows you to acheive higher spindle speeds and feed rates and gives you the extended tool life to go with it. Lets face it, it doesn't make much sense to make a part faster if you have to keep stopping the machine to change tools. A good friend of mine owns a small job shop in the area and purchased a machine based on this demonstration. He has been extremely happy with its performance. Because he has the high speed machining capabilites he has been able to keep a step ahead of his competition and has stayed above water financially during the rough times most of the other shops have just gone through.
Gunner