There's a couple of guys on here that are Fractal users. I believe
@Selta and, maybe, @jimfist , are both Fractal users. Having said that, I was thinking about an Axe FX-III or an AX-8, but it was fairly obvious, from spending some time on the Fractal forums, that Fractal couldn't give less of a crap about bass.
I know their effects are amazing, I had an FX-8 for a bit, and their amp modeling is state of the art, but Line 6 has done so much more for bass with their Helix stuff, and it sounds pretty damn legit. Plus Line 6 has been adding bass amp models on the regular, Fractal just recently let their users know which SVT they were modeling, up until then, it was just some random SVT model. Grab a Fractal, they sound great, but if you want real support for bass guitar, you're not gonna get it...
Honestly, I'd hold out for this, if I were you--->
Invalid Link Removed
Their Ampli-Firebox is VERY highly regarded in the guitar world, and there no reason to believe that the bass version won't be as well. There's gonna be a whole suite of bass amp and cab models, a very comprehensive editor, and it costs WAY less than any Fractal unit. It's supposed to be available mid-year, but I haven't heard any demos as of yet. I'm on the waiting list, but I just got a TrickFish Trilobite preamp, and it ROCKS! Good luck, my man!