you could just drop the oil pan and check the bearings yourself. any good service manual should help you do this. if it is a spun bearing, you just need to replace the crankshaft, new bearings, and repair the bad rod(along with gaskets and such). this involves pulling the engine and replacing the crank. also you could get a reground crankshaft with oversized bearings for a good price with your core. if you did not want to replace it, just get a new engine.

i have driven a car with a spun bearing which was caused by low oil(blocked oil passage in the crank). it did not loose that much drivability but eventually got really noisy. check out this link, its a toyota cressida site but it has a clip of what rod nock sounds like: http://www.thermactor.com/forum/viewtopic.php?t=5888