Having just got my bass GAS under control with my MIJ fender Precision + various tweaks, I've got some amp GAS well the amp head is sorted so i'm just gassing for a cab or two so I can use the fecker
In general though i find i GAS for basses and effects more than amps, once i find an amp/cab setup that I like then I tend not to change it unless I really have to, in fact come to think of it apart from my lil peavey micro bass I've only ever had my Marshall 3530 head and Marshall VBC 4x12 cab both now sadly departed