The earbuds will probably isolate as much as most of the closed headset recommended here. If those are working for you now, don't worry about missing info from closed cans.
Does your cube have walls that are above your head or below? If they are above and your volume is on the quiet side of reasonable, your neighbors will not be bothered by an open set. The noise leaking in can be a pain, though, depending on the ambient noise in your office.
Honestly, I think the beyers are probably among the most comfortable options and they sound good. Give them a shot. At least they won't break the bank. Many places have them in stock. You can return them if they aren't working for you.