Personally, I like logs that are 1-1.5" finished. I don't like them much wider or much narrower than that, but that's just my preference. I also like them all the same width, although varying the width within the block can do some interesting things to the block. Like this, as shown by the very talented QB member Barnbum:
http://www.quiltingboard.com/picture...o-t137116.html