Sorry to hear of your trouble. The same exact thing happened to me. My crank bolt broke off and just as I got to the side of the road my crank pulley hit the pavement too.

I managed to get the broken half out with a right angle drill and bolt extractor, both from sears. I didn't use anything to center it, just eyeball, and in fact I didn't get it centered, but the extractor worked great.

If you can get $3,000 that is awesome, I think. I have been thinking about fixing mine as it sits in the driveway, but now I dislocated my elbow a month ago and am still in recovery.

We have decided to sell ours and actually I just came here and saw your post as I am looking for a place to list ours.

Good luck!