Note that the article linked is from 2006. Things may have changed somewhat since then.

I have both DA and ultegra on my road and TT bikes respectively. Stifness-wise, I cannot distinguish between the two, although I weigh only 140 lbs, so any difference may be more noticeable for a heavier rider. However, the DA cranks just spin better, presumably as a result of the DA bottom bracket.

For performance/$ I'd go with ultegra crank/DA BB.