im looking to upgrade my rig a bit. i have an swr big bertha, and an ampeg bse410he, with a hartke 3000. im looking to enhance my stack a bit. i dont have a lot of money upfront so there will be some trading piece by piece with some cash included. any ideas where i should begin? should i get a new head first? what kind of head would be good for my cabs (they're both 8ohms). should i upgrade my cabs first? any ideas at all? im a little strapped for cash but i'm not completely broke...help me a bit here. p.s. i play indie rock with a p-bass...and a lil overdrive. i just don't like the sound im getting from my set up, i always feel like im breaking something when i crank it up.