you'll get a slew of answers on this and I'm sure all of them will have merit. I'll throw in my .02, worth what you paid for it;
What is your budget? How much do you shoot? What are your production requirements? I ask because if you shoot one box a month, then I would recommend a quality single stage as opposed to a progressive. If your budget is 300.00 Id recommend a Lee instead of an RCBS setup. All of the big names in reloading, Lee, Lyman, RCBS, Hornady, Dillon, make quality gear depending on what your looking for from that company. For example, I like Lee dies over others, but I would never buy a Lee progressive. If we know the answers to the initial questions above, we'd be much better at steering you to where you need to be.
If you shoot 2-3 hundered rounds a month, and are not constrained by time to load, and like most folks, have some money set aside but would like the best deal possible, then I would suggest a single stage kit. Two single stage kits come to mind, the Lee, and the RCBS. Both come ready to load minus the dies. They have all of the basic tools you will need. For quality I'd give my nod to the RCBS, but it is almost double the price. The Lee will load quality ammo for years and years, and if you find that you want or need nicer gear, your not out much money and in fact you'll be able to re-coupe some of that cost by selling to another begining reloader who finds himself in the same situation.
Along with the kits mentioned, you will need a reloading book, this is of great importance because it has invaluable information on the many aspect of safe ammunition reloading and it should be read and studied to ensure safe and successful reloading. Also, you'll need a cailiper, dial or electronic, your choice, but a simple one from Franford Arsonal will work just fine and run you maybe 20.00. Then a set of dies for the calibers you want to reload and your pretty set with the basics.
This is just a brief snapshot of an answer to your question, I could go on and on