Various favorites are smooth, but there are more than a few. To recommend one milder and refined English, for one example, I think Nat Sherman 536 is primo. It has a little burley which always appeals to me, but it plays a quieter role than most of my blends with burley. The whole blend is impressively understated. For Americana I like Russ O.'s Log Cabin, and for burleys I like a list.