There are lots of options as far as tanks go, with out haveing to stick to the narrowness of the 55 gal. You could go 65 gal, which is a sweet size for a first tank. I would agree go larger if you can. But first things first, go get a good book on the subject. The look at the space you plan on putting it in. I believe the 65 is 36X18X20, something like that. You mentioned setting up a reef tank, So there is some equipment envolved with this. Your tank, are you going to want the go sump ( it is a smaller tank under the main tank, it has plumbing to it and back, It filters the water and sends it back to the main tank) or Hang on the back filter. Lighting your choices could be Metal Halide or T-5's, pros and cons with both. but it all comes down to preference. Then you have a protien skimmer, (that helps pull the fish poop and other yukkies out of the water. A heater, Live rock (lr) Live sand (ls), All in all you could expect to drop an easy 2 grand before you even get to buy your first fish. But don't let this discourage you. It is well worth it, if you take your time, read, and don't short cuts. I beleive you live in Georgia, I am sure there are a few saltwater hobbist clubs in the area. Go to your local fish store (LFS) and ask them about any clubs in the area, Ask for numbers and or email addresses. They can hook you up with other hobbist in your area. Before you buy anything, get with other hobbist in your area, meet with them, They will be more than happy to show you their tanks, (we love to show our tanks to anyone one who is willing to look at it.) They can show you want the different equipment is, tell you what they like or don't like, It is some much easier when you are standing there looking at it. A lot of clubs have mentor programs, They could probly help you out, as far as good quality used equipment. Just my thought.
Good Luck with your endevore. Let us know how it is going