The reason I ask which cut is I believe there is a version with the same plates that is 120g pressed at United. IF your version doesn't have any pressing defects that bug you, I personally wouldn't upgrade just for the weight. If it's a different cut I think '07 may be more likely to be better.
I have the '07 180g and am happy with it. Not exactly the best recording but in my experience STERLING + RTI = Good.
@TenderLovingKiller® might have compared a couple as I believe he recently upgraded.