1. 15,000 will get you a very decent villa. Check out www.gulf-times.com under classifieds to find out what's in that price range if it suits your taste.
2. All electrical and electronic stuff run on 220v and NOT 110v here so if most of your stuff is 110, better not bring them. Almost all of the major european and american brands of appliances are here anyway. Just bring the stuff that you really need.
3. DVD's are region-based here. I'm just not sure if Qatar is part of Region 3 or Region 2. But try going for the suggestion of Novita.

Wish you all the best on your arrival...