Crap, I have a cracked block

In my original post weeks ago:

http://groups.google.com/group/rec.a...2925886f8c5e38

I was experiencing coolant loss and overheating, well I took the
exhaust header off this week-end and found a cracked block. I could see
the fluid oozing from the block.

I was wondering about my options thinking they are ( in order of cost,
high to low ):
a) buy new engine and install self
b) pull engine self, have it rebuilt with new block, install self
c) get used engine, install self

Anyone know of some other options I may have?

Mike