since anyone can force 1920x1200 res from drivers I say both extreme and performance. extreme is the future of benching for the next year as systems get more powerful.
I know it should be free, but if you spent 1500$-3000$ for your machine, whats 20$ for a license that you can use forever?
also- I dont want to use xp except I have to when I want a top 3Dm06 score, some may think I sound silly but I would rather be able to rightly test and tweak my system on vista than have to make a second partition, install updates, install drivers.