NY,
Out of your choices mentioned, I'd go with the Glock - if you're open to other 45 Hi-cap options, the FNP-45 is a niece piece as well, about 6 oz heavier than the 21...but recoil is easy on that frame and girth.
I know you didn't ask to be swayed, but I'm a recent 10mm convert as well - bought a Glock 20 with night sights this year from a buddy of mine. GREAT shooting gun that'd serve you well for your tracking purposes and could double duty for hunt purposes, depending on your states regs.