+1 what Ricand said.
I don't like the ceramic coated steel canning pots because they are really wide. You get a lot of boil off on those. I'd look at the SS line of pots that WallyWorld carries. They offer a couple of inexpensive tri-clad pots.
Also, I initially wanted to go bigger, but since I have an electric range I can't get much more than 4.5 gallons boiling. A 5.5 gallon kettle has just enough room. If you have a gas range that will put out enough BTU's, I'd spring for pot big enough to do a full boil for a 5 gallon batch. when you get started, you'll be surprised by how much a couple of quarts of extra room can make a big difference.
BTW Welcome aboard.