I'm a big fan of RCBS and own a couple of Rock Chuckers (one is a handmedown from my Grandfather dating back to the 50s), a newer Rebel and a Partner. I used the Partner for seating some times when I am running a production line with my Son. It's not strong enough to really do the quantity we do in terms of decapping and resizing, etc., imho.
Still, even though I love RCBS, when it's just me I go-to my Redding T7. I spend more time behind the T7 than anything these days and enjoy doing-so. I just ordered a
Creedmoor Enhanced Press Head for it. Basically a balanced and blue printed turret head from solid stock stainless.
Cannot say enough good things about the T7.
Sold my 650s when I quit shooting competitively and have never looked back. I still have a Hornady LnL which I rarely use anymore. Actually my Son took it home with him this weekend.
Point being, if you're going-to upgrade ... go big, within reason. Whether it be a Lee or RCBS or Lyman or Redding, consider going with a turret press and you'll likely never regret it. I've seen too many newbies jump from a single stage to a progressive and it rarely works-out.