i have a chance to buy a mesa m-pulse 600 for cheap. my current amp is a gk 400rb with a sansamp pedal. i'm in a punk rock band, i actually like my gk head but i was wondering if the mpulse is worth upgrading to. i had a buster bass 10years ago and couldnt remember how it sounded. any advice would greatly be appreciated. and if i do get the mpulse will i still need the sansamp to get that punk bass sound ala matt freeman?