The thing that I most disliked about the Steve Nash-era uniforms was the addition of the secondary color of grey. The Phoenix Suns have been purple and orange for the entirely of their existence, and while black is a neutral enough shade to wear as a third color (shade), grey just never really seemed to fit.
It was in that era, however, that orange was worn as a primary color for an individual jersey for the first time, a color that ought to be worn with every individual set of uniform styles so long as the franchise remains in existence.