A quick answer is: Macs are not "limited"; they are just different.
Another quick answer is: anything you can do on a PC, you can do on a Mac - and that includes running Windows (XP or Vista) and any PC programs.

A longer answer is:
I am an IT professional, I look after PCs and Windows networks and users at work, but at home I switched from PC to Mac two years ago, and I would never contemplate going back. My iMac is much more reliable than any PC I have used or supported - not a single crash or bug in two years; it's much easier to install and uninstall software and hardware devices; I have never used any anti-virus or anti-spyware software (which slows things down); software updates are never a problem; I could go on, but you get the idea. I have never had any problems installing any DAZ Studio or Poser content on my Mac, although I know there are some things available for PC only.

For the few occasions I really have to use a Windows program at home (e.g. MS Access, for the database systems I write) I just fire up my Windows XP virtual machine under Mac OS X and have it running in a window alongside whatever else I am doing.

I'm not an evangelical, I appreciate that many people prefer what they are used to; but I would certainly say to anyone give Macs a try if you get an opportunity - you won't regret it, and I believe you will be pleasantly suprised.

Sorry for the ramble...

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)