You can go for PvE shoulders and chest or head, really up to you. I suggest PvE shoulders anyways (since you won't need WF then).
However you should still do icc25n at least to upgrade t10 at least once, else there's really not much point using it.
I'd say go with T10 head + chest because you can buy ilvl 264 Raging Behemoth shoulders from AH (approximately 5k gold, roughly 3 days of doing dailies in Icecrown), which can also be used for PVP. This way you can benefit more from VoA runs since hands and legs can drop from the frost boss. It's also quicker to farm Wintergrasp marks for the on use ilvl 213 trinket (25 WG marks) instead of the ilvl 251 pvp shoulders (40 WG marks). If you want both the shoulder AND trinket from Wintergrasp, it could take a while to farm. However, if you plan on using 2 piece PVE T10 for PVP, maybe consider getting T10 shoulders + hands so you sacrifice less resilience.