20, 40 for 2.4Ghz, 20, 40, 80, 160Mhz for 5Ghz. 80 and 160 came with 802.11ac. Judging from this incredibly useful chart from "Notebook for WLAN Pros" I think, 80 would prob give you most spectrum coverage on the 5Ghz side.pic.twitter.com/NA1gFVBIba
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Note that anything marked DFS can be a bit of a pain to deal with, with mandatory 1-10 minute listening for non-wifi RF, and not all devices supporting it.