Is painting my car a good idea?

i drive a 2001 black c320. i love my car's color but i also know how difficult is to keep it neat[]. at night the car looks showcase new, but when the sun hits it is not a pretty picture. i find that on black car u can easily notice any significant scrach . now days im thinking in getting a paint job. but i'll like know from u guy if is worth it or not[?]? may a general idea of the price? and maybe if one of you have done it so u guy can direct me somewhere. im realy liking to chage it from black to gray. any commets will help me alot. thakns