More then you think. Especially if you want to do it for multiple calibers in quantity. I don't know how some of the internet reloaders get there prices down so cheap. Shipping, taxes, carbide dies, all the little stuff. It adds up.
I just put in an order with Dillon for $500 and I have a 550B already!
Do you NEED all the extras, nope, but if you want to enjoy reloading and stick with it, they sure help. Things like a progressive machine, multiple heads, magnum powder charge, bullet tray/feeder, case cutters, prep center ect!!
It gets out of control fast.
I would give yourself a budget of $1000. It will be less but at least you won't be surprised when it gets close to that.
And don't forget the only way to get the price of reloads down is usually done by buying in bulk. And if you do that all at once, it also cost $$$$ I have a spread sheet I use for calculating costs (includes taxes, shipping), and I find most rounds cost 1/3rd of what they do for one box off the shelf at Walmart/CT/WSS and about 1/2 of what you can buy some rounds in bulk for (9mm, .223, .308)