These might have to much sub-bass but the Atrio MG7 are non fatiguing, smooth with awesome sub-bass rumble. I'm not a bass head but I really like the MG7 because while they're bass heavy its very clean and the mids and highs are balanced. They're $109 at atrio.me with discount code CostProg50% (I think it still works).
Sub-bass I couldn‘t imagine, almost non-existing mid-bass, recessed mids and prominent highs - a little piercing to me, but that depends on the person. For example I find my M-audio Q40 not sibilant at all, while many others state just the opposite.