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Unless you got money to blow, keep your '99 SC4 as is. Shop around for a manual in better shape if you want one really bad. They are hard to find, but not worth wasting money. The majority of SC owners love and baby them, so be patient.
I'd definitely pass on that SC. Those kind of dealerships are rip offs. I tried to buy a clean 99 SC300 with low miles from one and they wanted $15,000 for it.
I would get a bigger house with a massive driveway if I were you. That way, you can buy a bunch of SC's and not run out of space.