The software on Mac is no different price wise than on windows, but point taken on the hardware end of things, but you do get what you pay for
and iMac wouldn't cut it for me as I use addon hardware in the form of PCI cards which you can't put in an iMac.
I have a dual G5 right now, and with luck in the near future I'll be upgrading to a quad core Xeon MacPro system.