I currently have a Gk 1001rbll and was looking to make a change in tone. I play a Fender P/J as my main bass. How would you describe the tonal differences, in general between the GK, the Mesa stuff, and Ampeg? Id like to stay in the same power range (at least perceived volume). Specifically, the GK is a little to modern sounding for me. Id like something a little less bright and more gritty, but not really distorted. What other amps should I look at? Im in Detroit, so I should have access to a bunch of stuff, but before I start driving all over town, I'd like to get some ideas.