[AndrewC]

Above the electroweak breaking scale, you have W1, W2, W3 and B, which are the fundamental bosons; below that scale, you have W+, W-, Z0, and the photon, which are mixtures.

Ahh, then there are no fundamental particles, everything is a mixture of massless things and the Higgs boson which is also rather elusive?

[Physicist]

Ahh, then there are no fundamental particles,

Perhaps. We don't know, yet.

everything is a mixture of massless things

Masslessness is more elegant, more mathematically pure, so I would expect truly fundamental particles to be massless, yes. But that's OK; after all, photons are massless.

and the Higgs boson which is also rather elusive?

The Higgs boson is also a by-product of electroweak symmetry breaking.