Even though it seems slight, you will get stronger performance from the 2000 Series Subs, especially down low.
If your total open-room volume is truly as you measure at ~2500cu.ft, sealed subs will be fine, and employing a full squad of them could boost your experience. It seems generally agreed upon that you start losing the benefit of cabin gain by the time you exceed 3000cu.ft.
Frankly, I would still argue for Ported Subs over Sealed. Other than size, you really don't gain anything.