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The 997 would be the more developed model and those bearings have had far fewer issues - but - there still has been some failures. There are kits available now that direct pressurized oil at the bearing for both the 996 and 997 (2006+). It is supposed to eliminate (greatly) the chance of bearing failure.
I'd research those kits (sorry, can't remember who make them) and lean towards the 997.
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Kurt
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