Prot - What should I upgrade first, weapon or shield?

I decided to start focussing more on my warrior prot spec. (previously arms)

My overall ilvl is 396 but my weapon is only 385 and shield 375.

Considering that this week PvP Conquest Reward gives a choice of a 1hand weapon ilvl400 or shield ilvl400, should I upgrade my weapon or my shield first?

Generally speaking, what is more important for a protection warrior, a good weapon or a good shield?

And in my specific situation, do you guys think I should upgrade my shield first since it is of lower ilvl or on the contrary should I take the weapon upgrade assuming that it will be easy to find a new shield from another source (at least to 385 anyway)?

Shield, by far.

Shield. /10char

Boots. Because that is how this game works nowadays.

i would get shield first