I use mostly solid carbide 90 degree spotting drills; if you set the depth correctly your hole will have a nice chamfer when done.
This is directly from the McMaster Carr web site;
90° point angle bits are for centering and chamfering holes that will be followed by a smaller drill bit size. 120° point angle bits are for starting a hole that will be followed by a drill bit with a point angle from 90°-118°. 140° point angle bits are for starting a hole that will be followed by a drill bit with a point angle from 118°-135°.
I have wanted to try some of the higher angle drills in the CNC; the drill bits (not the spot drill) want to chatter a little entering the 90 degree spotted hole if the feed rate is up where it should be.
Dave