This one's a huge favorite of mine at the moment:
And I actually love all versions of this one, they're all equally addictive:
The Diplo + Grandtheft remix is my guilty pleasure... And the Tiësto one isn't that much different from the original so I won't list it here either ;)
I've also been falling in love with pretty much everything Anjuna Beats puts out--like this one, the title of which is from my all-time fave movie "Eternal Sunshine of the Spotless Mind." Obviously I'm digging it.
And one for the road from Nero.