I have found good used presses at really good prices at pawn shops/CL.
Currently using one, a Lyman. Had a rockchucker, gave it to a guy getting started in loading. There are some premium single stages out there, like that co-ax posted. Area 419, I think, is another. Some get into Dillon 550 prices.
I use my 550 far more than the single stage, but Would not be without a SS.
For me, I don’t see the value in a spendy single stage. For you, it may be different. Some guys love a turret, some the bushing style.
All my pistol ammo is done on a 750.
RCBS press is far from junk, they are one of the better ones. If you want to upgrade, shift focus to powder scale, unless you have a good one. Elec powder dispensers are nice too. Plenty of things to improve The reloading experience.
What are you loading for currently?