If you've got up to 500.00 I'd buy a Dickey in a screaming heartbeat.
I hatched in this,
https://www.backyardchickens.com/forum/viewtopic.php?id=214772
and made enough money to buy this from folks tearing down a barn...
https://www.backyardchickens.com/forum/viewtopic.php?id=211843
The antique redwood bator is as close to a Dickey as I'm likely to come for a few more years - but they have a LOT in common. The solid wood cabinet, the rock stable temps, the size that allows for any size hatch you'd like.
Dickeys have all the nice modern conveniences but you know the old one suits me.
Sure I have to use the egg turners by hand instead of the bator doing it, and add water but it's simple enough and I'm very comfortable with hands on. I've been hand turning since I started hatching. The antique one's turners allow for turning an entire tray at once so a lot easier but still involved.
It's not plug and play and you know, that would be nice eventually, but incubation is about what you find that you can do comfortably. Lots of folks love auto everything and a Dickey certainly allows for that and is my goal but until then I'll hatch a LOT of eggs in lesser beasts and save up for one.
Good luck choosing. Lots of people don't think they'd use the bigger bators and buy the smaller ones, only to buy larger later. And some folks stick with 2 or 3 of the good small ones like
Brinsea, Lyon, and Hovabators. But the biggest
brinsea allows for 40 eggs max. Not a limit I wanted to set for myself.
In the end you'll find you have preferences. Good luck.