The first I managed to stick with (tried a Ton of distros starting in the late 90's) was Manjaro. Easy to install and it's been completely unobtrusive to use for the past few years I've had it. My main computer is still dual-boot with Win7 because there are 2 or 3 things that I simply can't do in linux, any linux.
Every version offers a live USB option so you can test-drive it a little. I think the biggest thing to decide is really the Gnome/KDE (or XFCE) thing. One's more customizable in terms of appearance, one's less resource intense.
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