It kind of sounds like you've sold yourself on the SDB. Just get that and if you find you need to load other calibers, then you could sell it for close to what you paid and get something else, or keep it as a dedicated 9mm press and acquire the next one.
I don't recall you mentioning quantity, however, which is really the difference between what you have now and any of the options that's being discussed!
The SDB is self-contained since it comes with integrated dies, so that's the price. Whatever you order, be prepared for a bit of a wait!