I'd go for a rust free SDL, besides being rust free it's more like a limo. I saw a beautiful, absolutely perfect 1987 300SDL sell on eBay for $6k just a couple of months ago.

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1987 300SDL 167k
1992 Volvo 740 140k
1990 Volvo 740 250k
1989 Volvo 240 269k

Anyone want to trade an old Volvo for an '87 300sdl?