I guess that depends on a number of things. Does the suit fit you well? Is it in good shape? Do you mind the colors? I have seen plenty of classics for sale at that price. The only major difference in the classic and classic II, as far as I have seen, is that the original suit was a single zipper front opening and the newer ones are all double zipper. It's just easier to get in and out of a double zipper.
As was stated earlier, the major difference between Classic I & II is in the zippers. Front zipper in Classic II is double zipper as in I it is single zipper. Also leg zippers in Classic II are longer so legs open up higher. As Chuck wrote, it's just question of ease getting in and out.