The current production Weatherby over-unders are not really in the same class with a Citori, though they may be serviceable. If money is tight, I’d suggest you look for a used Citori, preferably a Lightning model with the Prince of Wales stock, and in 20 gauge.
Choke tubes are nice to have, but I wouldn’t pass a good deal on a fixed-chokes gun. Likewise, the older Invector tubes are perfectly fine. Invector Plus models are great, but I doubt you would ever see any difference. I’d definitely want a 20 gauge with 28- or 30-inch barrels for pheasants. 26-inch barrels are no great handicap, so if a 26 comes along at a nice price, and I was happy with the gun otherwise, I wouldn’t be too upset. A 28 gauge might do - again, if the price is right, especially if you handload, and if you can hunt with lead shot.
I’m six-feet tall, average build, and wear a 35-inch sleeve. The Beretta 686/687s are beautiful guns, but don’t fit me as well as the Brownings. They generally are a bit lighter, seem to have more felt recoil, and can be a bit more pricey.