i've done quite a lot of research on how to install osx and there really aren't any guides for acer extensas. i have a current dual boot of vista and windows 7, and i was wondering if i could swap out the vista install for os x without having to re-install both os's?

and how would i go about installing osx on an extensa 5620? i really don't know which version to install, and which bootloaders and everything. so some help would be greatly appreciated!

Intel Core 2 Duo CPU T5550 @ 1.83ghz
3gb ram
I've got 2 111gb partitions