I would give some consideration to the Dillon AT500. It is basically the RL550 stripped down to be a turret press. That will give you the same learning experience as if you had a single stage press, plus you can upgrade it later to a full progressive press. In the mean time, you can use the cost difference to get dies, components, etc...
When I started, I only planned on loading for pistols but I liked it so much I started loading for my rifles too. That would be another advantage of the AT500/RL550; with the Square Deal B you can't load for rifles.
Not to be repetetive, but by all means go ahead and get a manual and read it so that you will be familiar with the process before you get your equipment. If you know someone that reloads, get them to show you and talk to you in addition to reading a manual.
Happy Early B-day!