To get more for this car, I think it has to be described fully to an audience that is already familiar with the car. Potential buyers would want to know every detail about its service & repair history. You might want to sweeten the deal by offering to cover up to $X of the cost of a PPI done by a party selected by a prospective buyer, if you know the car to be in good condition other than the two items you mention. I do see this model at auction that bring more than the amount you mention.
That said, I think those 2 symptoms are insufficient reason by themselves to consider selling, if you are otherwise pleased with driving it. IMHO, you won’t find many other cars that offer that degree of driving pleasure for that price point. Your nearby dealer apparently does not want to work on a car as old as yours. Dealers have numerous reasons for their policies, mostly having to do with costs to keep staff properly trained on what they service. But fear not: the 2 items you mention are most likely repairable by a competent independent repair shop. It’s impossible to fully diagnose over the internet, but I can offer these considerations.
Window regulators are known weak points in this model. This forum has detailed instructions for removing door panels to expose the regulator. Cables slip off tracks or guide brackets fail are the main culprits. These repairs at a dealer shop (including a new regulator) cost me about half what you were quoted.
There is nothing exotic about your car’s suspension. Any decent repair or alignment shop can diagnose & replace the components of a double wishbone setup. The upper control arm bushings seem to be the weakest point in the design. Mine had to be replaced at 30K miles. Your symptoms sound similar, but checking exactly which components are troublesome is straightforward for a suspension tech.
You will find that there are many components for your car that are common for many cars. Those can be handled by well trained, possibly certified, independent technicians. Maybe some members on this forum could offer you a name or two in your neck of the woods.