Dunno if you saw my response in the thread on the speaker forum or not, so I'll copy it here:
How big is your room?
If you have 1800 for a sub, one option would be a pair of 900 subs such as pair of these: http://svsound.com/products-sub-cyl-plpow2.cfm
or these: http://hsuresearch.com/products/vtf-3-ho.html
or these: http://www.epiksubwoofers.com/CaliberOverview.html
(plus leave you with some $ left over in the case of the Caliber from Epik)
Or, perhaps a better option would be put 600 towards one of these for EQ: http://www.velodyne.com/products/pro...5&sid=319n150j
And another 300 or so for bass traps: http://www.gikacoustics.com/gik_244.html
and then 900 for one of the subs above. I'd take any of the above subs over the PS1000
Another option would be a pair of these kits: http://www.partsexpress.com/pe/showd...number=300-742
which would leave 800 or so left over for bass traps and perhaps other room treatments- and you wouldn't necessarily need the SMS-1 EQ as the kits have a parametric EQ built into the amps.
Another option - head over to the DIY forum, 1800 bucks in a DIY sub will get you a LOT of sub.