I would say go with the second cage if that is your limit. I love the cage, it is easy to clean, enough room for a wheel (or two) The second cage is, pretty much, the minimum requirements for two gliders. I definitely recommend this one. The third cage was a good starter cage, but I've grown to love having two doors instead of one. You will have to zip-tie the smaller doors around the cage because they are the guillotine doors(not safe). If you browse ebay, and someone else might be able to recommend another site, but that is where I got my two. You should be able to find a cage that meets their requirements and your wallet size as well. :}
I am also into having a stand and not having the cage resting on the floor. Just personal choice...but remember gliders like to be up high the floor is not high, it is low. ^.^