The cost of the replacement crank is the only reason I am considering this. When you can find one they are usually around $100 - $150+ on ebay and you are hoping they are standard or can be ground to .010 under and not as bad as the one you have. Coupled with the cost of a new rod I'm ahead spending $55 on the current rod (almost new .010 undersized put on the engine by the last owner without fixing the crank) and having the high quality inserts.
I take it you've had good experiences with their shop? They can't be putting out crap if their set ups are holding togather at 5000-6000 RPM.