I love agaves too.
Some of mine get a bit tatty with frost here but I try to concentrate on the ones from low desert.
They handle out heat better here.
There are many cultivars and sterile hybrids that I'd like to obtain ,
but as far as I can tell aren't available in Australia.
I particularly like to find and grow ones that have ethnobotanical significance
Ones used for various things such as cordage and fibre,
sugar, pulque , mescal and other alcoholic beverages, food wrapping , soap substitute etc.
Some I just like because they look good, others because they grow such big bold leaves.
Agave salmiana is big.. I have a few varieties of it.
Agave mapisaga var Lisa grow to be a massive plant and I'd love to be able to get one into my garden.
Lots more species in my garden, I'll get some pics and post here
if I can work out how to reduce the size of the pics.