am thinking of adding a tom to my 4pc set. right now i have a 12" mounted tom and a 14" floor tom and also a 6,8,10 roto tom rack. i love the sounds, and the "feel" of toms. i'd like to add another but not sure which size to go with. should i stay traditional and go with a 13" or what if i got another 12" that has more depth or less then the 12" i already have? what is the difference between, lets say, a 12x8 and a 12x10 for an exsample? i kinda know what sound i am looking for but just not sure how to go by getting that sound. any ideas?