Not a direct answer to your questions, but.... since you just bought this car, I would give it at least a 2-3 month "shakedown" period to see what more pressing matters might come up. You never know what expensive surprise the previous owner might have left for you.
For wheels, I'd wait until your tires need replacement rather than wasting their remaining life. Then buy a wheel/tire combo from TireRack and you won't have to pay for mounting/balancing. Luke at TireRack can give you good advice on what to choose... I listened to him and was happy with the results.
Regarding tinting, I think it's a turn-off to many potential buyers, something to keep in mind for resale.
Of course if money is no object, ignore this post and have fun.
And welcome to the MB club!