If you're going linux it isn't fanboyism - it's straight up intelligence
Even though it is entirely possible to run linux w/beryl on ATi I urge people not to. If the vast majority of the linux community uses nvidia that gives ati much more incentive to be more linux friendly. It's a growing community that the (currently) foundering ATI/AMD really doesn't cater to at all. They do what they can to lose that market share :\\
Besides my laptop's 420 Go (similar to MX420) preforms better than my x700 in linux. Not sure about my x1950pro.