I like the ultralight stuff too. While its good for online work, it plays tricks with actual print work. For instance white ultralight type on black background can get some color shift in the details.
Helvetica/Neue I love, but it is frightfully common. I love sans-serif type.
A close second and third are Myriad Pro and Univers, respectfully,
...and OP, you used Arial, not Helvetica, in your sample. 😉 Arial is a bastardized Microsoft version of Helvetica. Very similar, but so very different.