Interesting that you asked that because this was THE most important thing for me when i was younger, but now i could care less, as long as everything looks good. I used to dream of having huge arms, but now when i see guys with HUGE arms i think they look stupid and musclebound.
I much rather prefer the look of a very nicely sized back and chest with muscular soulders and arms, all in proportion ofcourse.
As a side note i also do not like big quads, but i like nice muscular quads with big calves ala Arnold.