While I support a good upgrade of things, I'm still not sure why you want to change. You've been loading on the Jr press successfully, it handles your needs, and there's nothing broken. If you want to get a different press to split operations (decapping on one, seating on the other) that's fine. I've considered upgrading my RCBS RS5 press at times, but I've been able to load very accurate ammo from 38 Spl to 416 Remington Mag on it for more than 10 years. All my dies are adjusted for that press, and I don't feel like adjusting things for a new press.
If it's efficiency you're after, others have mentioned the Hornady Lock-n-Load adapters, which can make die changes very fast at minimal cost. I think Forster and maybe Lee make something similar.