I recently bought a new computer PC and after I bought it, I had a bunch of people tell me I should've got a Mac because it was "better" When i asked them why, I couldnt really get an answer, but i found out from others "why" they liked mac. One guy liked it just because it was the "cool" thing to have, no doubt influenced by the mac vs pc commericials. Then a girl i know recommended it only because she has one, and the only reason she got a mac was because a guy she liked got one!
But even that said, I have gone to the mall and been in the Apple store which is always crowded as if there is some kind of special event going on even when their is not. Needless to say, i think think these people are brainwashed by the "mac is cool" hysteria.
I also dont like paying 50% more for a computer that does 50% less. Here is a link that says 32 reasons why PC is better than mac. This will really show all the faults of mac so you dont get any surprises later if you do buy one.
http://www.pcauthority.com.au/Feature/92605,32-reasons-why-pcs-are-better-than-macs.aspx
Now i recommend a PC with windows 7 if you are a new trader and probably have a single screen. Windows 7 is so fast and you dont have to open the windows like you do on vista when you want to go from your trading screen to the web or whatever other program you are using. You can just run your mouse over the "E"(for explorer) and small windows pop up of which you can run your mouse lightly over it and it will show full screen that window. As soon as you move your mouse off it, it instantly goes back to the trading screen or whatever else you were at. (Hope i explained that correctly for you to understand) But Seriously...Win 7 is incredible. 5 minutes on it and i realized how much better it was than vista, xp or any other operating system, plus, all your old programs run on Win 7, unlike when XP upgraded to vista and some programs didnt run.