ah yes, ye olde steerer tube question.
extended steerers with masses of spacers above the stem can look bloody awful. However, I dont have enough hands & feet to count the times I've cut down a steerer, later tried to transfer the forks to another frame & realised the steerers just a "tad" too short
Personally? for my retro bikes that dont get much (if any!) use then I'll leave just 1 spacer above the stem (just incase!). For my actual riding bikes I'll leave like an inch of steerer with spacers above wherever the stem is. Why? When you come to sell the forks, short steerer forks just dont sell!, plus if you change frames, no guarentee your steerer will be long enough..