Good subwoofer for Monitor 30's?

I am about to give my dad my old Polk PSW10 sub and would like to get something a little better. I currently am just running Polk Monitor 30 bookshelf speakers for my fronts (2.1 system) and would like to spend no more than $300. I was looking at the Mirage S8 and the Athena P4000 but I don't know if either would be a good match with my speakers. Thanks in advance!
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