mating epik sentinel with what sub?

[WormInfested]

hi guys
i'm tossing around the idea of a second sub to compliment my sentinel which is 625 watts and is rock solid for a sub. i'm looking at the mfw-15 or the ed a5-350. i've some dayton stuff on ebay but looks like nothing is ported at all. could my current sub outperform and hold up longer than a lower wattage sub? or not? i'm new on a few things. my room is 14x15. my sub is aiming at the couch on the left side. i have two spaces up front between my towers and the tv. the right side of the room has a standing wood stove to the far right of the couch and a front door directly to the right of my right speaker. i like the mfw-15 but unsure of the power and if it can stand up well with the epik.