Hi and welcome!
First- always buy from a real dealer. The back up and knowledge they have is invaluable.
Second- go check out your local dealers and feel them out. Buying from them establishes a relationship. You want to feel safe that they have your back down the line- every mower will need service, no matter how good it is.
I'm biased towards Hustler. For one thing the Cub is an MTD. Ugh. Second, the RSD in 60" is a lot of mower for the money. Nice seat, plenty of engine, welded deck, engine guard, Kawi... And 0/48.