I have had my PRS P22 for a few months now, and have decided to add some equipment to my set up to take advantage of the guitar's piezo output. I am currently deciding between an acoustic amp (Ultrasound AG-50 DS4) and a DI/PA set-up. At the moment I feel like I am splitting hairs on these pieces of equipment, both in features and price, but I do not have any experience with acoustic rigs. Fishman's Aura Spectrum seems to be throwing a monkey wrench in my decision making.

Is there a need for a DI to polish the piezo output or is there internal processing that takes care of this before leaving the guitar?
Does anyone have any experience with the Fishman Aura Spectrum's Imaging and the piezo output? I understand that you cannot turn the sound of one acoustic guitar into another with the Aura, but this is not an acoustic guitar. Are the images redundant with the piezo output or is there a significant difference between the images? Are the images useful for the electric-piezo world?

Is there anything that I might be missing deciding between an acoustic amp and a DI/PA set-up?

Thanks in advance for your help.