I have the F3 - is rapid fast although can be a little noisy at times. Never had a wd so can't comment sorry.
Yes the drivers for the single card solutions from ATI are good - just don't count on having an efficient crossfire setup for a while - My 4870x2 still isn't performing properly due to the ATI programmers being MORONS who completely underfund and ****-up the driver development. Seriously, if it wasn't for Nvidia cards being overpriced I would urge you to go with them. Unfortunatley, even though it pains me to say it, ATI still currently offer better value and the 5870/5850 are INCREDIBLY power efficient and run very cool.
@Obsidian86 - 5770 driver problems? Interesting...thanks for letting me know - I thought they would have been the most stable of all.... I guess nothing is too simple for ATI to f**k up