I'm a split w/ Chumley & jaybeerman:
WLP051/WY1272 - Love the intangible character & fruitiness it brings combined w/ the darker malts. Winner, winner chicken dinner!
WLP007/WY1098 - U just can't mess w/ success. Classic strain for fermenting this style! Try a 20yr. old John Courage RIS sometime.
WLP005/WY1187 - The "dreaded" Ringwood Ale (a.k.a. Swedish Porter) strain. Great... IF you can get it to perform in the fermentor. The "original" Baltic yeast strain.
Can't go wrong with the first two for certain... the latter will do even better with a big starter & open (shallow) fermentation. Good luck!