Is there anything that exists that is a boot selector with options that is more bios based? Like, after the computer posts, it comes up with an option from which hard drive to boot from? I wouldn't mine building one PC that has say 3 seperate hard drives, each with their own O/S on it (not just partitioning a hard drive 3 ways). Drive 1 = windows, Drive 2 = OSX86, Drive 3 = Ubuntu for example.

If that isn't an option, what do you guys think of building a computer and not putting any internal HD in it, but using an external dock with eSATA and just switching drives for whatever O/S you want to load up?

I'm seriously considering building it, just need some suggestions. I've always had some Mac envy when it comes to certain things, and I'm very eager to set it up.