How much is an engine rebuild?

basic rebuilds for a long block, assuming you pull it and put it back in, will be in the $1500 range. but i figure if youre in it that far, why not spend a few hundred extra and make a 331/347? pistons may cost another $100-150 for mid grade units, and a crank will be $200+ if you shop around (eagle had some listed in their 'cosmetic defect' category for $150 last month on their website). and youll save $100 on required machine work of your old crank. why not?