Is your guild a 10 man guild or a 25 man guild?
I'd get the T10 helm next. I wouldn't use 251 shoulders over your 264 shoulders unless you really want to use the 2pc bonus. If you can get a token for the shoulders then that would be ideal. After that you have two choices:
a) stock up on frost emblems for T10 gloves/chest and hold them until you can get them to 264 or 277
b) sell saronite for dolla dolla bills or donate to your guild or something.
Edit: specs/gearing/gemming/enchanting look flawless to me otherwise.