Well - 10 years ago I played with a Mac for 1 hour.
Bought my first one on eBay 2 days later
Never ever looked back on having a PC.
I use windows at work because I HAVE TO, and as much as I can I do my work on the Mac and send it to work via email, dropbox and mobile me
I believe a 2nd hand one is a good starting point to figure out what you're in for with the OS X. You can always sell a Mac...
My 2cents
Cheers
Beto Boton