I've got a couple of Gen 2's myself.
Some will say their inductance is too high but I don't think it's too big of a deal, and not sure if reasonably priced currently available alternatives are any better.
I think you can get very respectable results.
Is that volume for one or both boxes?
How skilled/ambitious are you as to enclosure builds?
In order of complexity: sealed, ported, bandpass, horn (not sure it's suitable for the latter)
How much of a priority is ULF (10 - 20 Hz)?
How much power is available?
Answer those and I'll model some WinISD sealed/ported for you.
P.S. Where did you get those spec's?
Googling I found the below (the 13mm xmax must be a typo).
Actually I saw the same spec's again here, though that's from 2001
Ill let you try to figure out what you have and I'll use those parameters.