So what do you experts recommend as a torque wrench for a shadetree like me?

You know, the type of guy that would probably do one or two head gasket projects in his lifetime, and maybe a few other related repairs that would require a torque wrench...

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car