I'm against the one die does it all method for a couple reasons.
First, I wouldn't want to reset my die every time I put it in the press. Once mine are adjusted, I like to leave it alone. Resetting the die everytime you use it is going to lead to a mistake somewhere down the line and you will have a bunch of ammo loaded that you didn't size properly and can't close the bolt on... It happens!
Second, you have to buy the seaters anyways. At the cost of buying single seater dies you can usually buy the whole set for not much more money.
Using a single type s die and swapping out bushings and resetting it each time you use it is going to get old very fast. You need the seaters anyways.. Might as well buy the sets.
I'll edit to add,
The OP sounds as if he's relatively new to the hobby. Keeping it simple right now would be the best thing. A type s die and a handful of bushings is not it.