Sorry to post ANOTHER which x thread, but i don't really know much about bass amps.

I've been playing for about 6 years on and off but only seriously for the past couple of years. My current amp is a Kustom KBA10, which i think is broken because i don't know how something could sound that bad otherwise. Budget is $500 Australian (~$400 US). I play everything from jazz to metal, so versatility is key. I plan to use the amp for teaching, so 2 inputs would be good but not essential as i can buy an A/B box or something. Volume-wise it doesn't need to be too loud, but loud enough for jamming with a drummer and guitarist would be nice. Oh, and it needs to be able to handle a low B well as both my basses are fivers.

Suggestions i've had so far:
Fender Rumble 25
Orange Crush 35B
Acoustic B20 (might be hard to find in Australia)