If you're expecting more stable and better performing software from a Mac, think again. OSX is in many respects a step backwards for the Mac. Ask anyone who works seriously (ie. not surfing the web - a telephone can do that) and regularly on a Mac and they will tell you about the frequency with which they crash and the "anomalous" operations that OSX seems to perpetrate. Particularly Windows users who are expecting something amazing from Apple computers latch onto this. They are not the stable supercomputers they are touted to be by Steve Jobs, or anywhere near.
You can get a lot more PC for the money and it'll be upgradeable.