what to do?

Make sure you have considered everything in the $950. Are the rods assembled to the pistons or are they full floating? Do you have the means to gap the rings? Does the machine work include installing cam bearings, frost plugs etc? I would go with the short block and do the head work and final assembly myself for a $450 difference especially if the short block comes from a good source with some sort of warranty. Just my opinion.....