I will disagree that debian is hard to install.Ok its not as easy as the worlds largest Operating system MS, but A little Linux knowledge would be an advantage, but information on installing debian is widely available on the internet.
If you are new to Linux, go to a linux help site or debian forum.
The advantage about using debian is the face you are not paying for a license for every piece of software you use. An example of this is the fact, you can get an entire office suite which compares to some other major players on the market for free! I know a lot of people who say once they have left other operating systems and gone to Linux, they dont go back.
Remember, if you are buying a new computer, and the option is given if you want to purchase the operating system as well, at a cost of an extra £100, say no you have Linux.
Give it a whirl. This product could be cheaper, but, its not too bad, putting that to one side.. most software packages are free.
Debian is a strong linux contender it has been around for many many years, and it was one of the original ditrobution to hit the net. It is also a RPM based distrobution. However, the fell of this distrobution is for more advanced users. You can tell this right away with a DOS/NCURSES looking install interface. Not very pretty, and it is very confusing especially on on a advance install. However, despite the instalation problems. Debian will give you a very basic loking linux with out all the bells and whistles of the flash Redhat or Mandrake type of distrobutions. Debian is truely geared for the serious server types. Looking for increased performance and less flashy looks.