I have an 07 M3 on order and am the first one in line for it at my dealer. My sales man said the price for a base model M3 will be around 56k to 58k. And with every option checked will be close to 70k. They are actually probably not going to build a convertable because they do not want to cut into the 650 conv and ZM4 sales.

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Dinan M3

2006 X5 4.4i Sport Current Vehicle
2006 CLS 55 AMG Current Vehicle
2010 FORD F-450 King Ranch Current Vehicle
2012 GL 550 Current Vehicle

1999 M3 Dinan S3 SOLD
2001 M3 Dinan S2 SOLD
2002 M5 SOLD
2004 X5 4.4i sport SOLD
2007 335 XI Lease ended
2009 E92 M3 SOLD