Continuing what Johnk said about Macs being expensive:
Their cheapest Mac laptop is $1044 last time I checked.
Its about the equivalent of a $600 laptop.
There are some distributions of Linux that can be installed on Apple Macintosh computers, however, this DOES NOT make purchasing a Mac worth it.
Like I said before, Windows is preloaded on most computers anyways.
You can use a boot manager like GRUB or LiLo to boot both Linux and Windows.
A note about using WINE (
Wine is
not an
emulator)
Wine supports almost all .exe files, however, there has been reported difficulties with some programs.
Installers requiring a .MSI file may need a separate program.
Please see the following for information on Wine and programs that are compatible with it:
http://appdb.winehq.org/Another note:
If you plan on using Ubuntu, you probably want to make sure you have an Internet connection (for updates, and using the Synaptics Program Manager) so you can get more applications.
A final note:
Good luck on what ever you end up choosing!