600 = Ultegra

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600 = ultegra, but keep in mind that technology has trickled down, so that even tiagra from today will probably shift better than 600 from 10 years ago (shimano hierarchy --> sora, tiagra, 105, ultegra, Dura Ace, Sora being trash and dura ace the sh¡t). People say that performance between Ultegra and 105 is very similar, weight being the only difference, but they all agree that the D/A shifters are far superior than all the others. If it were me, i'd go D/A shifters, Ultegra cranks and RD and 105 everything else, unless u want the polished alu shine of Ultegra and want to blow all the cash on it (i would) best of luck with the building and enjoy ur ride!