Pull the engine and tear it down, then you'll know what you're looking at. Check to see which bearings spun (main, rod, cam), what got scored up (crank, rods, cam) and how much damage was done to the cylinders. The valve guides could have been damaged also, but with a rebuild, I would have the head completely rebuilt anyway.
Before removing any of the main caps or rod caps, mark them with a number punch set so they all go back where they came from, they CAN NOT be mixed up. A complete engine rebuild kit will probably run $800+, and I could see the machine shop bill going that high also, really depends on what needs to be done. Price parts from your machine shop as they might be competitive with online prices, and some of the parts you won't be able to buy in the correct size until machining is done. What size pistons, main bearings, cam bearings, etc...
Have the engine balanced... It will add to the cost to the rebuild, but will make then engine run smoother., less vibration. Look for recommendations on a machine shop, friends, etc.