hey all, so Ive been prowling through the posts here looking for some opinions. and there are a lot of them. let me explain my situation and then I'd love to hear some advice. I'm playing Bass in a Stoner/Doom metal band. Sabbath, the Melvin's, Mastodon,Sleep Electric Wizard ,Orange Goblin. riffy low end stuff. my current set up is a GK back line 600 head and a 2 10 cab and a 15 cab. a boss Octave pedal and a Russian Big Muff. I use both sparingly and rely more on the clean sound. the bass I'm playing now is a Fender Areodyne Jazz. I got it at the right price and it's got a neck I love. I have smaller hands. but. I'm looking for something else. a deeper growl I guess. so I've been thinking about a different bass. now I'm drawn to and torn between the Gibson Thunderbird IV and a Rickenbacker 4003. problem is I can't find 2 in the same shop to compare. they both sound and feel great....but I'm still not sure. with all that in mind what do you guys think? thanks!