I installed SUSE on a server PC recently and liked it quite a bit. I'm not using Linux on my primary computer yet, but I decided to switch to it as my main OS when I build my next PC (which is soon). I've been using Windows since version 3.1, and up until Windows 2000 (which I'm still using) they've made significant improvements to it. After that it's been going downhill. Luckily Linux is now a very viable alternative to Windows as a desktop OS (compared to 5 years ago) and I've been very impressed with it.
You can by the way try a live CD of various distros, but there are a few that are specifically designed as live CDs. I've tried
Knoppix and
Mepis. I think Mepis had better hardware compatibility. Either way, just burn the ISO to a CD, set your BIOS to boot from the CD and you can check out Linux without installing it.