Perhaps the DX 7? Only for the fact that it once sold for over $2,500 and now you're lucky if you can sell it for $300 for it these days. It was very hard to program too, (without a computer). (I kind of think it was overused for a while - ) But boy was it built like a tank!

or perhaps the FB-01?

Great bell sounds but horribly 'swishy' in the low end...