IMO you would be better off with a level 1 system from Musicar NW. Musicar's systems are plug and play designed specifically for your car. I haven't heard BSW's but I doubt they are much improvement especially with no amp and the eq on the base system.
You can also piece together aftermarket audio equipment yourself and save some money. There is plenty of info on this forum start by reading the stickies.
Last edited by bmw325i; 07-28-2013 at 10:19 AM.