It is time to buy some new gear. Now what series of parts will you spend your hard earned money? Hands down, I would suggest that you should spend your money on Ultegra level parts. Sure, your bike already weighs 15.85 lbs, but shelling out $175 for a Shimano Dura-Ace cassette might give you a psychological help in your racing, but for most mere mortals, stick with the Ultegra level stuff.
Why do I say that?

Most importantly, Ultegra is more durable than either Dura-Ace or 105. It costs what, $15 to $20 more than 105, but weights about the same. It is all about the coatings on the metal that Shimano does so nicely. The Dura-Ace stuff uses more exotic metals like titanium. But Ti has the disadvantage of more wear. Save the $100+ and buy an Ultegra level cassette.

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