I do wish the BCI I had for many years had been a dwarf boa- but she was a homeless snake that all her previous owners feared & hated- she was a feisty yearling biter- actually she was just scared half to death of everyone after changing hands so many times- but anyway, I took her in & fixed that, lol. Not wanting such a large snake, my intention to calm her down & rehome her only went as far as calming her down- she was adorable & never did bite me- not that she didn't want to at first. I just didn't let her- & in a few months she learned she had nothing to fear, & she no longer felt like biting me.
You mentioned liking the "big ol' puppy snakes" so the Aussie pythons might not be quite big enough to fill that order, but mine does like warmth & being held- they're just not real big or chunky.
You've got the right idea- to hold out for something you'll be really happy with for a long time. Shows are fun & tempting but shipping is pretty safe, as long as it's not in the dead of winter (responsible sources won't ship then anyway).