I can second the Technics 1200 for longevity. They are among the top turntables used by professional DJs and withstand the abuse they go through in that industry quite well. For standard home audio purposes I would expect they'd last a lifetime. They can also be purchased used with some frequency, although you can never be quite sure how much abuse the motors have seen.

[black]-"The further we go and older we grow, the more we know, the less we show."[/black]