Cockatiels & Greys seem to be a common 'thread' here. Not that they're friends but that they're possibly a natural progression.
I too am interested in getting a fid - I help with 2 tiels. TAGs & CAGs are up there in my wish list. As I'm older I've decided to wait until my cat passes away & approach a rescue to learn handling & care of a larger bird + adopt thru them. Of course I'd love to get a baby & enjoy that part too, but I am worried about the time that is available - I think you now what I mean.
All the best with your new fid - post photos of your tiel & the baby when it arrives.