There is a trend, especially with CF racing frames, towards new BB standards like BB30, BB90, and BBright. This limits ones ability to swap parts around. For instance, having invested in a Quarq power meter that fits the threaded BB of my steel Gunnar, I find that my desire to be able to move the Quarq to a racing frame is limiting my N+1 choices. Of the bikes I'm currently considering, only one (Specialized Tarmac) is available with a threaded BB. There is a similar trend towards tapered head tubes. Both trends are based on eliminating flex, or at least making that flex elimination easier to accomplish.
So my question, to those of you who have experienced both the old and the new technologies, is: How much difference does it make?
Especially given I'm a big, 200 pound (well, actually 199.3 pounds now!) guy, should I bite the bullet and go with an oversized BB, reconfiguring my Quarq, or, (ga$p), buying another one?