I've been playing my Dean bass through an Acoustic Lead Series G10 amp for about half a year now and I love the tones I can get out of it, but I've started playing in a band recently and I don't believe that the amp's small size is going to do very well once we start playing gigs.

We play anything from pop-punk to metal and the lowest I've ever had to tune the bass to is Drop A#, although that's pretty rare and I usually only go down to Drop C, so I'm wondering what type of amp or amp/cab combination can get me the same tones (able to sustain anything from darkly subdued tones to punchy bright ones) for under $500?

I know the $500 budget kind of pushes the limits, but used equipment would work the same for me as new equipment would.