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Current 2000->up GT2, GT3, and Turbo engines are based on the "old" 1964-1998 Mezger air-cooled, dry sump engines. They are more robust then the newer "M" type engines in the 1999- 2008 (996, 997 C2/C4) 911.
Especially when used on track. These "M" engines are really wet sump engines that suffer from oiling problems that should be addressed (accusump is one way) when tracked. They also have problematic ball bearings on one end of the IMS. ( Google IMS bearing.) When this bearing goes bad the engine goes with it.
That said it is hard to beat performance per $$ that you get with these cars.
We have a 2003 996 C2 Cab that we have been enjoying for the last 20K miles with no problems. These cars are truly enjoyable as everyday drivers and , many owners that drive them every day have over 100k trouble free miles.
If I were in your situation I would look for GT3 or Turbo because these engines are based on the race bred air-cooled engines that preceeded the "M" types.
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2013 991.1 Carrera S Cab
2004 996 Turbo CAB X50 sold
2003 996 cab 6 speed Sold
1972 RS 3.2 twin plug short stroke crank fire, roll bar, sold
DE instructor since 1985
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