This article is in german. At the end of the article it has a sound track of the engine revving up . For some reason they thought it was benifical to record the sound of the car doors closing. Based on the information in this article it shows the price as 51,129 EUR. That is almost 1:1 for the US $. This might support David S's post from yesterday stating the US price for the M3 coming in just under $50k.
Here is another link with some M3 info. http://www.t-online.de/lifestyl/index/motlix62.htm