There are two reasons I hear people choose a Mac over a PC. First, they claim that the physical design is more pleasing. Second, they prefer the Mac operating system. If you truly want MacOS, you’ll have to buy a Mac. While it is different than Windows, I personally don’t find it provides a great benefit. Again, that’s my opinion.
One thing I can tell you is that there are vendors who create pleasing hardware designs for running Windows. One such machine is the HP Touchsmart series. The computer itself is housed inside of the monitor (23 inches in the machine pictured). Many of the all-in-one designs will use laptop parts due to heat. In this case, a desktop CPU is included as well as a discrete graphics card so you get some decent bang for your buck.
The monitor is a touch screen monitor. For some things this can be quite handy. Yet I wouldn’t consider using the touch screen to actually draw or edit images. For that I would rely on a mouse or a graphics tablet. While I really like this machine, I doubt it is something that will sit on my desk for my day-to-day work. For me, it would probably be best used as a secondary machine for consuming media and/or Web surfing.