I take offense at your statement, since some Korean cars are far better than some of the trash coming out of Detroit nowadays.
The Kias and Hyundais aren't bad cars at all, especially if you remember what the original Hyundai Excel was like.
The Daewoos are junk IMHO still though.
As for multihulls. If you're spending that amount of money, it probably makes far more sense to get a custom beastie, rather than a production one. At that size and price range, the price difference between a custom built boat and a production one are fairly minimal. Have you had a chance to see some of Chris White's designs. They're quite nice. They're also a lot more rigid and solid than their fiberglass counterparts, being made of cold-molded epoxy-wood composites generally.
I've never been a big fan of FP btw. Also, one thing to realize, the scantlings on a multihull are generally a bit lighter than those of a similarly sized monohull, mainly due to the fact that they're not carting seven or eight tons of metal around with them, and don't need to have the strength to support that mass.
If you want to know more about multihulls, I'd highly recommend Chris White's book, The Cruising Multihull. While it is getting a bit long in tooth and in need of an update, it is still an excellent resource.
In terms of full disclosure, Chris White's a local to my sailing area and his boats are fairly common here as a result. I've also seen/been on a Gunboat 48 at a local marina. They're nice boats...but too big and pricey for me.
Most of the best multihulls I've been on were custom-built, using wood-epoxy or foam-cored fiberglass composite construction.