I am looking for a gun I can use for USPSA competition, side arm for hunting and running around the woods, and later non-concealed carry defense. The guns I am looking at are the Sig P226, Springfield XDM, Taurus PT1911AR, and Taurus PT92/99. I want something that can be used for all the above, reliable, ability for use with light bearing holster(blackhawk serpa lv2 preferably), and a big factor is price. I also cant decide as to caliber,
Caliber:
USPSA:
45ACP works in "Single Stack" class. Expensive ammo.
40 cal is a good caliber for limited/limited 10 Major. Ammo cost is less than .45 and more than 9mm.
9mm works in 'Production' Class Minor load--can be loaded to major load but you run into dollars for the Open Class gun. Production equipment is the least expensive.
HUNTING: I don't know about these cals for hunting.
Can you hunt with 45 ACP? Hunt what?
Can you hunt with 40 cal? Hunt what?
Can you hunt with 9mm? Hunt what?
OPEN CARRY: 45ACP is the hallmark here.
40 cal works well here.
9mm works well here with quality SD ammo.
Guns:
USPSA: 45ACP Single Stack-- A wide range of 'quality' pistols can be used.
40 cal-- In limited class you'll see a lot of high dollar custom guns and accessories (like very high cap mags)Kimber, ++++. In limited 10, you'll see a wider range of pistols including 1911 styles, the CZ 40 cal and all the brands you mentioned.
9mm--Production Class-- XDM, M&P, CZ SPO1 variants, Glock, some Sigs and a few others.
With your requirements, my suggestion would be to go with 40 cal. if it meets your 'for hunting' requirements. It meets the other requirements very well.
Because you liked the "Sig", I would suggest you also try a CZ SPO1/CZ40 cal. It has the same ergonomics, steel construction fine accuracy and reliability; but is also cheaper, higher cap, and accessories are less expensive. It also has a .22lr conversion kit available for less expensive practice.
For a first centerfire pistol, I would recommend 9mm as easier to learn with and due to pistol, ammo and accessory costs. Unless you reload, ammo cost can be significant.