[mtlplshr]

very good question.i have used a 2600 rpm with mixed results.it has a lot of hours on it and i am shopping for a new buffer myself.i have just about decided on a 4600 rpm craftsman sander,and am going to make a mandril so i can mount 4 8 inch wheels side by side(will give me about a 3 inch wide wheel)and do some serious buffin.i have met guys who say they use a 10000 rpm grinder but have never seen one used.i have used my buddies 5000 rpm with a cutter wheel and tripoli and it definitely did a faster job than my 2600 did,without worry about catching an edge and pulling my arm off.its a craftsman too but no longer avail.from sears.the 4600 i'm lookin at is like $109 at sears and looks to be heavy duty(it weighs 12 lbs.!)let us know what you end up getting.thanks