If you have to shoot no-tox I would spend more and get a modern made in America gun from Tony Galazan.
The company is called Connecticut Shot Gun Manufacturing.
They also have tons of used SxS shotguns. I would fly out there and take a couple days and take look at one they have.
They made the reproduction Parkers and Remingtons.
They still make double side by side shotguns on a CNC machine and hand fit things.
If you can find a Ruger Gold label it will pound the hell out of you, but that would be ok. They only made 1000.
This is the RBL "round body launch". It is the only 100% American made side by side shotgun for under $5000
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There will be a lot of older American shotguns of varying quality and vintage.
No one is making any side by side or over and under shotguns other than Galazan and KOlAR in America that I know of.
Kolar makes olympic type skeet and trap guns. They start at $15,000.
If you look on Gunbroker there are Winchester M21's and Parker Reproductions.
The most important thing other than you liking the way the gun looks is that it fits you.
If you are right handed and left eye dominant or vice versa t needs to fit your dominant eye. This is regardless of what you have done your entire life.
If you are going to screw around with it, and not get super serious then it doesn't matter.
If you are going to use it for waterfowl, you are going to want a waterfowl model. it will be heavier and have much longer barrels.
If you are going to do both waterfowl and upland you want a mid weight gun.
Obviously if you are going to only hunt Chukars you probably need a 5 pound side by side that fits you well.
A lot of "it depends" answers.
I think Bass Pro in rancho Cuchamunga has a fine gun room still. maybe?