I'm going to assume you are talking full loads. So, you want a 29 or a 629 with the endurance package. 29s with the EP are hard to find and expensive.
Those start with the 29-3E. 29-5 arguably the best design wise. The 629s start with the 629-2E, with the 629-4 arguably the best of the bunch.
These are pre-internal safety lock and pre-MIM parts. Personally, f
rom a design standpoint I don't have a problem with MIM parts but from a collectors view point, some do.
JMHO the best design wise (a shooter) S&W 44 Magnum would be the 629-4 DX. The 5" being a grail gun for me.
My 629-4 5".
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