Hey guys I'm new here, but Ibanez is definitely something I have experience with. After playing virtually every bass they've made over the past 5 years (excluding their high-end 6 string models) I can say that their products are getting decidedly better. I bought a SRX400 about a year ago, and I absolutely love it. The preamp is active, but it isn't weighed down by an EQ, it's just Tone and Volume. It's a great bass for a moderate price. I mean it is kind of cheap, but really Ibanez's four strings are all relatively cheap.
I am not a fan of their SR series and never have been. All of the models I've played have awkward necks, and I really don't like their preamps at all. The sound is just too sterile for me, but it does kind of have that "standard rock tone" that I've heard a few other bassists refer to.
At any rate, I think their BTB, SRX, and perhaps the higher end 6 string SR's that I've never played are great.