Stack Exalted up, and swing with Tormented Soul or Vampire Nighthawk (and use Battle Mastery if possible for double strike).

$14.20 as of May 19 2013

Lots of maybe cards, need to do some play testing and see what to swap in.

Less budget oriented upgrades:

Swap Nevermore for Surgical Extraction

Sublime Archangel and Lingering Souls (or Entreat the Angels) can be put in place of Nefarox and Duress for more aggro at lower cost but it provides less utility