ok, i went to the local guitar center today and tried out the GK 600 Backline and the GK 1001RB with a Fender American St. Precision bass so i could tell the differences when turning knobs on the amp and such. to my surprise, they both sounded great. as of now, i've narrowed it down to the 1001RB(i didn't have a need for the seoncd channel on the Backline) and an Acoustic B600H(whihc i also played today). looks like i just need to go when they aren't busy so i will be able to really sit down and try each head out to its full potential, thanks for the inputs guys, any other suggestions are still open
~Taylor