I forgot to ask, how does the guage affect the sound? I like a 'warm' sound, and definitely want to avoid 'tinny' on the upper string, but I want ease of playing too. I aim for rich tone and 'mellow' sound, but don't have the technique to always (ever?) pull this off!
So as far as the sound/guage thing goes, is it a 'brightness' thing, or a 'thin' thing. Somehow I find the lower strings are less problematic in the 'sound' department, but maybe that's just my 'tin' ear. Any info is greatly appreciated.

One good thing about music is that when it hits you, you feel no pain - Bob Marley