54" FC8000 is a top notch plotter, beyond a shadow of a doubt. Sure there are some other nice ones, but that plotter should be able to handle most any sign project you throw at it for the next 10 years.
I have a Mimaki, FC8000 setup. I only have problems with the crop marks when I'm cutting through Pro-Shield laminate. Otherwise, it works great. I'm using the cutting master software that came with it because I haven't upgraded my Flexi.