"Best budget desktop computer available"4.0 starson by gammada
Pros: Awesome design and build quality. No virus or malware to worry about, no anti-virus software to slow your down. Can turn into a portable system, there's even a remote available and you can couple it to an iPhone or iTouch to control it via WiFi
Cons: If compared to other PC alternatives, the entry price might seem a little steep, all the more so when you add an Apple keyboard, mouse and/ or monitor. You can save by going the PC route with these components.
Summary: In the PC-world you can probably buy a faster, better equipped computer for the price you pay for one of this tiny Macs but if you're going that route, you're entirely missing the point. When you realize that using a computer is not a synonym for anti-virus, painfully slow start and shutdown times, disk defrag and constant pop-ups warning you about critical updates, system risks and all the other niceties afforded by Windows, you know you've made a solid investment. Is not that the OS is bullet-proof but as long as the system remains low-profile as a hacking-target, MacOS X is the way to go until Linux manages to get all known commercial apps under its belt.
Another key difference is that a Mac comes out of the box with useful and awesomely easy-to-use software and very little else in the form of trials, whereas a PC comes fully loaded with bloatware that is sure to take a sizeable chunk out of your HD and a toll out of of your system's performance.
Last but not least, if for some reason you really need to have Windows with you, there's bootcamp and parallels, one allows you to run windows just like you would on a PC, while the other is going to let you use Windows alongside your MacOS X system.