Kisa, can you give us a link to the cage you are getting??? I remember that seller, but I hated the website layout....
My mitred conure, Charlie has a cage that is 23"L x 19"W x 33"H. The cage wires are so wide that it was probably designed to house an amazon... A larger cage for him would be nice, but this is what came with him... He's a rehome (like most of my birds), and I haven't bought any of my rehomed birds.... Charlie's cage is on the left...
My cherry head has a cage that is 32"L x 21"W x 36"H, total heighth being 62". It was only $100 instead of $150 as what they normally sell for... Well it was only $100 because someone else bought it, then never used it and just stored the cage, unused, in the box it came in... so I practically got it brand new! She only recently got it, and I have yet to set it up for her, as I want her to get used to the cage before I put her in it... She (and her buddy) have been cage free for a few years so its going to take some time to get at least one of them (the conure) used to living in a cage again.
