I don't see an Ultegra Octalink anywhere, I'm assuming they are way out of production? At least that is what they say at Lickton's. Is the 105 pretty good? I'm looking for a triple. I think my plan will be to get the 105 first, use it for a season or two, and get the DA one (for it's servicability) in the future. I overhaul my BB twice/three times a year so the maintenance part doesn't really bother me.
Also, weight isn't important . . . I'm not racing.