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I wouldn't compare the Optima to a Cavalier - it's a lot more car. Heck before I bought my '02 Maxima SE (at 15k miles), I seriously considered a new Optima. Dang nice cars (for a daily driver)
C-4s are not investments. If someone is looking for appreciation, use the stock market or real estate. C-4s are getting to be low priced performance. Probably more bang for the buck than anywhere else.
Not to mention they had a relatively long run and lots of cars were produced.