I've worked on the math for d/w prot DPS, making a spreadsheet on it, but never finished it.
If your acting as DPS as a prot spec war, you can do a couple of things. Are they asking you to be 2nd on the threat meter? Are they asking you to step out of your spec and DPS, without worrying about threat? Are you soaking cleaves, hateful bolts, etc...?
If your required to actually put out some DPS, dual wield is by far the best choice. Spamming whirlwind, heroic strike and devastate are pretty good DPS strategies. The reason I add whirlwind is because of it's lower TPS, even in berserker stance, devastate can be pretty high TPS. Heroic strike is good for that extra DPS, but it can lead to higher TPS fairly easily.
For your d/w set, focus on Strength above AP. You'll get 10% more from Strength just being prot.
Edited, Aug 3rd 2008 12:11pm by devioususer