Here is what i would do. Before i go anywhere near a paintshop I would look ahead. Decide what you will do with the car.
If your plans are to lower the car, stiffen the suspension, upgrade engine with heaps of power and make one "mean street machine", that you can glide on the "strip" with. Inca would be the color, even golfgelb could do the trick. It would be a car that everyone would notice and you would turn heads.
IF everyone had original cars, that would be boring too.
I have no idea of your age and your desire. For me i´m to old for street machines (not that i have anything agains them, but with me in one, it would look like a misplaced grand-dad)
Then what i would do if the car was mine, again it´s personal. I would stick to Saphirblau. (yours almost looks a bit too dark to be saphire though) And put a couple of nice looking 15" aluminum rims on. Even though i don´t like to do what everyone else is doing, I have to admit that Alpina rims looks good on an E21. (think 2/3 of all europe´s E21 has got them)
My E21 is home waiting for me, i´ll be back from work on saturday, I will take some photos of mine and publish them here. For now I only have original steel rims for mine. Alu is coming on sooner or later.
Cheers
Tor