like i said, brain dead! i've found that for the most part, the theorycrafters suck. they spend more time with all the math than actually getting good. hmm that idea applies to everything in life now that i think about it.
ive tried every spec thoroughly. my guild runs with 4 dks. 1 frost, 2 unholy, 1 dw unholy. single target fights, i'm 500-600 dps higher. aoe fights 1.5-2k higher. the only time they can pull my dps is the 15 second trash kills. it's by far, the best spec for ulduar as many fights have some aoe in them. keep in mind, i'm the least geared dk too.