Practically anything aftermarket will be better than what comes with your stock system.
In my 3, the Bose does sound a LOT better than the non-Bose(depending on an individuals ear, most will agree when Bose applies over stock) and I'm glad I had paid the extra $1,500 package for it, but the truth of the matter is that with $1,500 I would have a system that blew Bose out of the water. If your car didn't come stock with Bose, don't bother putting it in, just find some aftermarket speakers you like and install them, or install them yourself. You will not be disappointed since you will have more visatility.
Welcome to NICO BTW. Do you have any pics of your car? We LOVE pics!