Which would make more sense? re:Runetotem set and dual specFollow

I am kind of in a pickle. I run balance and resto: typically balance for my heroic dailys and emblem farming, and resto in groups where I know the people and trust the players more than your average pug. I am a pretty casual player, so farming emblems takes me quite a while. I can buy two or three pieces of my runetotem set, but can't figure out which would make more sense: running resto in the balance set, or running balance in the resto set. I would say that overall, I definitely play balance more, but obviously people are depending on me a lot more when I am resto. Opinions?

What I tend to do is have Moonkin main set and Tree offset. Heroic gear? Tree. Raid and emblems gear? Moonkin.
Only time I use emblems on Tree is when I dont need more gear of that type of emblem for moonkin.
Maybe you could try that.

My day ended up being kind of interesting. I got a group that (politely) told me that my gear was crap. I was told I should try out ToC to gear up... Fair enough, but my gearscore was too low to queue for it. I grabbed a few more emblems and headed to icecrown. I picked up the balance runetotem head, shoulders and hands and tossed some gems on them, queued up, and got dropped into ToC with a group that didn't chat much except to mention my crappy gearscore. @_@