Definitely check out Warwick, I picked up my Corvette Std-5 for $600 a couple years ago. Their Rock-Bass line isn't bad either.
If you like how the Ibby plays, you could move up to a nicer model. I have a SR-405 that I really like. The pre amp is a bit noisy but overall it sounds pretty good.
To be honest I'm kind of turned off by Ibanez basses now. I have a NON bass guitar that I LOVE and so I figured I'd go with them for their basses. This is the second Ibanez bass I've had that I don't like. I'm sure it's just their low end stuff though. They're both low end SDGR models. I bet if I got a badass higher up model Ibanez bass it would be good. I'd rather go with another brand at this point though.