Facebook ads can get you great installs, and very targetted too...but can go upto $1.50 CPA. If you want lower costs look at Millenial Media or Tapjoy. I would

Facebook ads can get you great installs, and very targetted too...but can go upto $1.50 CPA. If you want lower costs look at Millenial Media or Tapjoy. I would put the $1000 purely into getting direct downloads as opposed to any brand/awareness building campaigns.