Easiest Linux is Ubuntu, in my opinion. Software is made available very simply.
I tried to do what you propose, and found Linux too limited. It wasn't the OS, but all the channels I knew were to deliver Windows content. So I gave up too easily. I dual boot, and use Linux to repair whatever Windows infections I or neighbors get.
Linux is less prone to virus, at least until more people move onto it.
[EDIT:
Sorry, forgot cons...
- cannot (yet) buy software for Linux in local stores,
- cannot play your favorite Windows games without an emulator (which may require you to do a lot of tweaking),
- Linux is a console-based OS, with a windowed wrapper, so when you are tweaking, you will likely be doing this at a console,
- your office apps are usually not available, which requires retraining,
- cooperating between Windows (your clients) and Linux can be a bit taxing.
]