10 years from now do you plan on living in same spot? 20? get the best you can afford now that fits into your space. later on if you need more, you can add another. i would get a ported model 1st to try out. bigger is usually always better with subs, maybe you could get a 15hp and use as an end table.
Power: Marantz sr7008, NAD C 275Bee x 2, Video: Oppo 103, Samsung 75un6300
Speakers: Focal aria 948, Focal cc900, Klipsch synergy KSF 10.5 Subs: Rythmik FV25HP, Rythmik FV15HP