Probably pick the A5 but any will work. I use open chokes, SK or IC. I do have some fixed choke guns which are Modified and they're ok too.
I like sixes, some like fives, fours are dangerous to victims of accidents, and in my mind, unnecessary. Standard high brass type loads are plenty good. No need for Prairie FireStorm or Golden Pheasant or premium loads in my view.
I wear a Filson strap vest. Others like other vests, I prefer it.
Yesterday it was 21 degrees and 20mph wind. I wore uninsulated Kenetrek boots with wool socks, just like normal. (Thousands of pheasants are shot every year by people in tennis shoes. YMMV.)
I did wear long handles under my usual pants. I put on two under shirts, a button up shirt and a wind shear sweater, then topped that with a rain/wind shell. Thin leather gloves and put on a beanie over my usual hat. If it had warmed up, I'd have been able to react easily. I don't generally wear a hunting coat when bird hunting. Many do however.
My best gear move this year was to get hi viz lenses for my Oakleys. So maybe think about your shooting glasses too.
