Holy crap thats the truth i went from 1 to 11 in 10 months when i started.
I am in the same boat that others seem to be in where i have some empty tanks now and a lot of cheap gear i dont need... However i like being able to see the animals and I think the enclosure is cool even though i cant put any live plants inside though i would love to. Racks are great but if you want to see your animals more often than when you handle with them/deal with their cage tanks are helpful.
So...
DONT buy a cheapo thermostat. Get a good one, there are plenty of suggestions on this website but the herpstat from spyder robotics seems to be a favorite.
A tank is cool, you will need plexiglass or a towel for the budget hobbiest to close off the screeen to keep humidity up.
** also if you are buying a baby and you dont want to buy another tank you can get a 40g (which is the largest you will ever need) and clutter it up with stuff like wood or other "decorations" to keep it comfortable until it grows up.
DONT buy a bulb, get a UTH (under thank heater) it should cover a quarter to a third of the bottom of the tank.
Balls dont tend to be climbers but mine always interact with the wood that i got back in the way and its better than having a bare tank. And they can help clutter the tank if needed.
Get 2 hides one on the UTH one on the cold side
A water dish that can hold the entire animal... so get a larger one, it will grow quickly particularly the first year...
Aspen bedding is the way to go...
Most importantly, starting looking at rack systems. When you get your next, and you will youll want to start putting them in a rack, everyone is right, its way easier to manage a rack.