Hi, that card is not as good. You really want to run this on windows XP, it will work MUCH better.
Even when running natively on windows, Skyrim really pushes these machines to their limits, so running it inside a virtualized windows on Mac OS, you really won't enjoy it. There are a lot of bugs as is, so you don't want to increase them by running it in an unstable environment .
Look for Bootcamp 2 disk image in the torrents, as Apple will probably "not support" this machine anymore, ie you won’t be able to get the Bootcamp drivers from Apple, *I think*. I also think the Bootcamp disk image was included in the OS X install disks that come with the MBP.
The Cider port I tried at first had some stupid Post Process Injector (inkjfx or somehing) mod included which obviously drops the FPS so look for any d3d9.dll files there remove them. The only d3d9.dll you really should try is from the FPS Limiter mod, set it to 60 FPS. It worls great here, also try FPS Booster (Skyrim Nexus)
Anyway, I'm now updating the ini files with my current settings. If you are running Skyrim version 1.4.27 or above I recommend you move your ini files out of their location, then run Skyrim launcher and re-coose high graphics settings at 900* 630 with no AF or AA, to generate fresh ini files as things have changed with recent patches.
Play the game to test it out, after that you can try turning on AA and AF or try my ini settings (minus the bit that contains the graphics card name) to see if they work better or worse.
Good luck, any questions just ask, I'm here twice a week at least.