I am for the more modern thread less steerer tube with a stem and the necessary spacers. I don't subscribe to the flipped and slammed theory, I have about 25mm of spacers on the bottom and left the tube uncut. I have 2 spacers above the stem and I did go to a flipped stem after my back loosened up from riding a bit. I have both a quill and a thread less adapter for my other bike, a 95 R500 and can adapt it to fit me or one of my children should they need a bike for the day. The thread less or Ahead set set up offers me more flexibility and different stem lengths and the ability to use the newer over-sized bars, as mentioned above.

Bill