I am looking at maybe going to a 6-Core (Mfr # Z0P1-MD7701) since apparently they have sold out most of the old 12-cores the past week.
Would a move like this be much of an upgrade?
I use mostly Photoshop CC, Illustrator, Indesign and some AfterEffects, Motion and FCPX.
You can find a slightly used 2009 4,1 and flash it to 5,1 and purchase a 6core for the best bang for your buck. Depending on your budget, I would get at least 24gb of ram and if you work a lot in AE than 48gb should be good. I find myself breaking past the 24gb mark when working through premiere and after effects. You will also benefit from a high end gfx card such as a 580,680, or 780 for AE Cuda or a 7000series for OPEN CL, FCPX and Motion.
You will notice an improvement depending on your workflow and complexity. Not sure what spec your 08 model is.
I noticed that you have the Photoshop CC. How is it compared to CS6? The reason I'm not for the CC is "Rent to Never Own."
I've been using CC for a few months now and it's been great. Only reason I went with CC was bc it was paid for by my company. It's constantly updating and you will always have the latest version. If you are using the creative suite to generate money then it's a good deal esp if you get in on promotions like I did for $29/mo.
I deal with r3d 4k files so the updates do improve my workflow.