What does the other panel look like? if they are both in need of paint it might be worth the effort to remove and paint them. I think re painting the panels and center unit is alot cheaper than buying new. If you can find a parts car with the same color's that would be an option for you. Removing the center unit/dash panels is alot of work, if you can live with the down time its worth it to me.
The passenger's side panel looks great. And I already have a new pocket ready to go on for the driver's side. (The bottom edge of the pocket is pretty abraded.) So in one way, buying a new side panel would be the cheapest/quickest. $750, demount the old, swap the hardware and then remount the new. Both doors would look great at that point.
The console/paint problem would then be its own issue, but that is really mostly cosmetic; it's not like that the peeling paint really affects the look/use of the car as much as the possibility of the door inserts falling off/out. I'm just not sure how good I could fix the problems I'm having with the door inserts. I'm assuming the colored panels from MB are the whole panel, not just the inserts? So to get that on the passenger door would require painting I think, or buying two and trying to mix and match. Although that would be an interesting solution and might look the best, I would be limited in the color selection and that would also be a bit pricey. (So if I wound up doing just a repaint, I would probably like to do something a bit different color wise . . . which means I might like the seat inserts to match . . . etc., etc., . . .
Of course with the way things work for me, once I have the panels off I would probably want to swap out the speakers too . . . etc., etc., . . .
Since I tend to take a long time to get things done! (I just ordered the rest of my new headliner/top moldings to replace the old yellowed ones) I think I need to try to keep these in "bite sized" increments.
Right now my priorities are;
1) Finish my interior roof. (Moldings mostly - headliner and cylinders are done!)
2) Get my trunk panels back in the car. (Left hanging over from my roof top cylinder swap.)
3) Get my new stereo HU sorted and mounted. Here I'm having issues with popping and, as I'm trying to address that, an "oily" OEM Amp . . . (??))
4) Driver's side door panel since the armrest sag bothers me when I'm driving.
5) Painting/remodeling the interior. (The driver's side seat is also showing a bit of wear, passenger's side is still in great shape.)
And of course this is my only vehicle and I'm in an apartment lot most of the time.
(Just a bit more challenging that way.)