You might also wish to consider the possibility of using a software RIP from a third party. That's something you could purchase at a later date if and when you were to decide you needed it. Some folks prefer a good software RIP to on-board PostScript capability anyway. You might do some research first to see what you software RIP options would be for that particular model of printer.

If you took a "wait and see" approach, and it turned out that you were comfortably doing everything you needed to without PostScript, then you'd be money ahead by not having bought the embedded PostScript capability.

Our DesignJet 500PS doesn't have embedded PostScript, but instead, came supplied with a "baby" software RIP (at a $500 premium compared to the non-PS version of the printer). I imagine that the 500 couldn't hold a candle to HP's newer stuff, but for our purposes, it has been (and continues to be) an absolutely dynamite piece of equipment.