I'm a little late to the party but I'm using Ubuntu myself. There are a handfull that are pretty good for starters. Ubuntu and Linux Mint are probably part of those. And I see others have given you some advice on good ones as well.

I would suggest to not just jump off the deep end but maybe make it a dual boot or install it on a spare computer. It's probably also usefull to make like a list of applications you're using in Windows and see if they're available on Linux. And if not, what alternatives there are. It helps if you are willing to try some alternatives to your daily applications when they are not available in Linux. But worst case scenario there are a lot of Windows applications that can run inside Wine in Linux.