TRUST ME go with the mac!
I made the switch from PC to MAC about a year ago and the MAC is soooooo much better,
Go have a look at the webiste www.apple.com/getamac/
I really have seen NO disadvantages with APPLE, where as with a PC,
they a extremely ugly and poor designed,
the software is rubbish and so complicated
constant attacks and viruses... REALLY there is too much to list.
Where as with a MAC not only are they beautiful physically but the software is amazing as it all works in sync with the computer because apple makes the whole lot... where as with a pc the software is chucked together from all different sources!
Not to mention the new upgrade "Leopard" is brillant!
I know a MAC can seem a little more expensive at first but it is well worth the little extra, with a PC you will pay more in the long run with things such as the constant upgrades needed to the virus software etc!
And also, a MAC can run both Windows & OS X, (not that you will even want to run windows as OS X is so much better!)
And if you do need Microsoft Office (Outlook, Messenger, Word, Excel etc) You can purchase this for the MAC also... so basically a MAC is EVERYTHING good about a windows PC and much, much more!
Once you get a mac you will see, windows really does not compare!
Good luck and I hope you decide to go with the MAC, you wont regret it!