As said before, the higher up the line, the less gain for your $. If you have to choose between a lighter/better wheelset OR DA/Ultegra, get the wheelset and stick with Ultegra (or 105). That will make a much better impact on your riding. That said, I do run a Ult/DA mix but am contemplating switching to an FSA compact crank with an 11-23 rear (versus the 12-25 I use now). Best.