We bought our JV3-130SPII a couple of months ago & we have been running straight through Flexi. We started with a bootleg copy of 7.6(I know, tsk, tsk). It did not work well, so we got the legitimate copy of ver.8. Works like a top!!
Al, Brian is right, that is my arrangement too. & I agree with the others that it is a fine arrangement. If you use Flexi-Pro... it has a good rip already & is all you will need. I have it on a dedicated workstation & although it is a powerful (& expensive) design tool... I really mostly just use it to output my jobs. The designs are typically done on my Adobe software first.
I also have signlab & just use it for cutting vinyl, on another dedicated workstation, so different people can run different jobs simultaneously.
My edge runs on Omega on another dedicated workstation.