My 2011 E92 M3 was about $70,000 pretty loaded also. I think for the price/performance its a great deal. A new base GTR is $90,000 the black edition is $100,000. A stripped down Porsche 911 will be $90,000 at base and if you go with the S or 4s and add a few options you are well into the $100,000 range.
Even used ones retain their value and are not that much cheaper. I think the M3 gives you the best bang for your buck. Its a great daily driver, a great performing car and fun to drive for the price.
You can load up the current M3 with every single option and not break $80,000. BMW will keep the price very similar to what it is now. I would except the base stripped version of the F80/F82 to be close to the current model.