Dang thats tough. In the spring I'd go for a Hofbräu Maibock, in the summer just about any true Kölsch, in the fall a Surly Furious, and in the winter an aged Corsendonk Christmas Ale.
If I had to choose one, I might go for HB Maibock all year long. Love the malt bomb that it is.
Primary #1: Empty #2: Empty
Secondary #1: Berry Rhubarb Wine #2: Black Currant Wine #3:Border Crossing Vienna
Kegged: Orange Pale Ale IV, Hidden Lake Nut Brown
Bottles: 2H IPA III, Carmel Apple Cider, Spruced Winter Warmer, Surly Bender clone, Big 50 Barleywine, Framboise Lambic, Dark Belgian Strong, Kicked by a Moose Scotch Ale, Russian Imperial Stout, Sparkling Elderflower Wine, Barolo Wine, On Deck: Ice Shanty Bock