Wow, thank you everyone for all the great replies!
We did get our new tank today, which I'm really excited about. We got one of the last two they had left. This was the first day of the sale, and we were in the door within a half hour of opening.
Unfortunately, we still haven't decided on a stand that we both like yet. We are really indecisive. So, if you know of any really good stands or sites for stands, that would be helpful. Our stand for the 10g is rated for a 20g, and we know it is sunken in the middle a little. The doors on it kind of stick together when you open it now. When we put it together, they were very easy to open. We really don't want a mishap due to a poor stand, especially with a 55g tank.
We did decide on 2 AC
70s, which we are pretty happy with. They're obviously still in the boxes at this point, but we feel good about our decision to go with them. We bought 2 24" hoods since our tank has the bar in the middle. We also decided to grab a magnetic algae scrubber. (Our tank is glass) We've never had one before, but we had a friend recommend it. So we decided to go for it. We are getting the gravel and air pump tomorrow.
Hopefully, we will be ordering a stand by tomorrow evening so that we can start cycling our tank soon. I can't wait to grab a few decorations for it. I'm thinking maybe a piece of driftwood and a few rocks. We are definitely going to try to have a planted tank. It's going to be tricky with our fish buddy; he likes to redecorate his way. (Comet goldfish). He doesn't eat the plants, he just likes to pull them up. I'm pretty sure he has made it a game at this point.
Anything really important that I'm missing, please let me know!
Whenever we finally get everything and get it together, I'll definitely post a few pics. Thanks!