Unless you're watching movies how much sound quality are you really going to gain from doing this? Those Rythmiks are very nice subs for the money, and don't get me wrong, the Funk Audio stuff is top of the line (and I mean top of the line), but in your smallish room you're already using two quality subs, so... You'll gain headroom, but you probably won't notice much SQ difference once you re-level match and apply PEQ to the subs.
This is more about bragging rights, isn't it?