Just don't go cheap. I put a 2x BSA on my 44 mag once, and had cracked glass within 6 shots.
I then upgraded to a Bushnell 2-6, and it worked fine. You 500 will have lots of recoil so anyone with a good reputaion for customer service would be my go to.
No offence on this next thing please. If you just dropped that much cash on a new 500 don't cheap out with optics. I can see no reason to buy a $1000+ gun and put a $100 scope on it. Handgun scopes are fairly costly even for a lower end model.
Might also what to check out a holo sight or something similar. A red dot may also fill you needs. Go somewhere that has a lot of options, and check some out.
Me personally I don't like a scoped handgun for a number of reasons. Others love them. Go try a few, and get what you like with the above in mind.
May also want to buy from a BIG retailer as the customer service will typically be better than a small mom and pop shop. If it fails they will typically make it right even if the manufacturer won't.