Sub options
You can get a lot of sub in the $1200-1400 dollar range, a lot more than a 10" woofer and 250 Watt amp!
Check out the options from SVS, HSU, and AV123 in your price range. AV123 is selling a pair of the new MFW-15 subs for $1k for example. These are great for a large HT but are not small by any means.
For something smaller, check out the SVS SB12-Plus for $6-700 each. I went with one of these for a WAF/performance compromise.
Edit: I saw the location in your sig. Velodyne, JL Audio, Martin Login or Paridigm might be more readily availabe over there. I know that SVS exports, but I am not sure about the other ID companies.