Welcome to GNU/Linux
It is great to have another user interested in GNU/Linux. I also have a SONY VAIO laptop, but my graphics card is Intel.
I think all the distros support Nvidia cards, you just have to install the driver.
I use Fedora 7 and it works great in my laptop. I installed it from a Live-Cd and I didn't have problems with my wifi driver, but a few days ago I installed it from a DVD and now I have problems with the driver. And this problems are worst in Fedora 8, that is why I am still in Fedora 7.
Why don't you give Fedora 7 a try? (remember, use the live-cd).