Usually there are 2 thinks that go bad on a furnace, the thermocoupler and the blower (fan). On newer units there are printed circuit cards that can go bad, but that shows up pretty soon after install.
Someone mentioned that older furnaces are built better, that's crap. They're built heavier which isn't better. You most likely should buy a modern efficent unit, in the long run you'll save tons of cash.
Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats.
H. L. Mencken
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