I don't know what you mean by "normal house cage"..they come in all sizes.
Yes, they do like ladders, but if cage is small you might not have room for ladders until you get a bigger cage. Can you measure your cage without freaking them out? or estimate how big it is?
Millet is really not all that good for them, so keep it to a minimum or not at all. And yes it IS messy! LOL So.. yet another reason to stay away from it.
I just ordered these from petco.com http://www.petco.com/product/106805/PETCO-16-Cement-Perches.aspx?CoreCat=LN_BirdSupplies_Perches
*thanks for the heads up illusive
So maybe they DO have them in store Mike? Ask someone at the store.