Get a Mac mini, and a KVM switch to hook it up to the same keyboard, mouse and monitor and use both the PC and the Mac.
Then, if you are comfortable with the Mac, ditch the PC and load Windows on the Mini (windows can be purchased from your PC sale), if not, you can sell the mini without having to go through the process of purchasing Windows, and without losing much money.
My children have PCs - mainly because they love to game, but my daughter has had pcs, and converted to Mac a year or so ago when she saw me using mine.
The HUGE benefit of this is she is knowledgable in both systems (she is 13), and a couple of her teachers now own Macs and she helps them like she does with those using a PC. The school has also now invested in four Macs (amongs severasl PCs).
In UK schools, most (if not all schools) use PCs over here. However, conversion is slowly starting to take up as some schools are now equipped with both systems, and a handful fully converting to Mac.
My daughter's couple of gripes about the Mac are MSN and using a webcam - I would have to m ess around getting a standard webcam working and then again to get MSN to work with it. Yes, I know there are ways around it such as using ichat instead, or aMNS (still requires messing around with standard webcam), but she only wants to use MSN.
Her other minor gripe (and I fully agree) is the inability to connect a headphone/micorphone set without needing to buy either a powered USB headset or Imic.
I think this is ridiculous TBH, and my powerbook that I paid over £1500 for, still needs a powered amp solution such as Imic or a powered USB headset - this is my big gripe
Not sure about the latest minis in the headphone/mic stakes, or the latest powerbooks, but I would have hoped that Apple have addressed the issue.