You will always need a good single stage press if you load for rifle. There is no practical reason to ever move one on unless you are getting a better single.
As far as another to load pistol cartridges in volume, give serious consideration to the Lee Classic Turret. It seems to work well and is economical. No doubt that the T7 is a good press, but the Lee will do what you want if you are considering moderation in your needs. And it is less expensive.
Alternately, if you plan to load a high volume of pistol rounds, the Hornady Lock-N-Load AP is the way to go both for functionality, performance, as good a warranty backup as you will want (or need), and low cost. Dillons are good machines, a little dated in design and technology now compared to their Big Red competitor, but the cost for equivalent functionality puts them way up there in unjustifiable expenditure beyond name only.