HG's
It'll cost you about 2K to get your HG's replaced. If you can find a mechanic that'll do it with the felpro HG's I'd go that route, as they tend to be the best aftermarket set that's out for the SC.
Just because your HG's are gone, providing you didn't drive around a lot with them blown, doesn't mean there'll be a problem with your engine.
I just had my rad replaced because it cracked over the winter, what fun that was! My poor car hates wpg, heh.