I've been internally debating about what kind of distribution to dual boot with Windows 7. The distros that I have used are Ubuntu and CrunchBang, and I've been looking at Linux Mint. I know that Mint has a lot of users and that it's generally regarded as more user-friendly than Ubuntu due to MATE. I would appreciate a more user-friendly interface over minimalism. On this distro I'll be gaming, editing video, recording gameplay, editing audio, and browsing the web.
If you have to ask, choose Ubuntu.
Ubuntu is far and away the most accessible to Linux newbies. The Xubuntu and Kubuntu variants are actually better, though.
However, if you're wanting to move beyond Ubuntu, there are many options. Arch, Slackware and Gentoo are three common enthusiast destinations. Fedora, OpenSUSE and Debian itself are common moderately-involved choices.
Zealotry aside, there is no one be-all end-all distribution, so it may be wise to try a few before settling on one.
DistroWatch may also be useful.