Answer
Depends what you want to
spend on, anything with the recommended size is fine,
depends on the brand and quality. since i put a lot of milege on my car i
purchased pirelli tires, but i also have 17" rims instead of the standard 16", and different sizes for my front and rear tires, and all that adds up. the 17" will also give a less smooth ride cuz you really feel the road. i think mb recommends using michellin or continental tires if you go to the dealership, but i have
also used dunlop.
try some out and find whatever fits your budget and liking.