Elemental Designs is the way to go,they ship anywhere if you don't mind paying shipping costs,i'd def go with them or SVS or
www.hsuresearch.com or
http://www.epiksubwoofers.com are all great sub woofer manufacturers
polk isn't known to make great subwoofer's the Polk DSW Pro-600 lacks bass under 30-35hz...the amp is small...get 600 dollars+ worth else where..you'll thank me