I'm gonna install some from here http://www.laptopvideo2go.com/ when I get around to it. There just the nvidia ones unlocked to work on mobile cards. Unsure if they have any loss of functionality over the apple ones.
I'm using tweakforce.com drivers and so far I like them, but I think the stock Nvidia drivers work the best...so I will be switching back to them. Give them a try and see if you like them.