Either Wagner Dot 4, or Valvoline. DOT 4 is better than DOT3 due to its higher boiling points (Dry 446, wet 311 for DOT 4 vs 401/284 for DOT 3). I also looked on O'Reilly's website, and Wagner's DOT 4 seems to be the same price as DOT 3. So for no extra cost, get the better stuff.
Prestone would be my third choice. The wet BP is 284, but the dry BP is 470.
I wish Prestone made their DOT 4 by the quart because that would be awesome. Its wet BP is 311, but the dry BP is 510.