Basically any 2-letter TLD should be avoided unless you live in that country.

If you want to be clever, use subdomains and pick one of the new TLDs. For instance, ban.anal.ink, is like $5.

You could also choose a 5-10 digit .xyz domain, those cost $0.85

Except for the only one I’d want:

…Why?

abc.defghijklmnopqrstuvw.xyz

Can’t you do abcd.efghijklmnopqrstuvw.xyz?

Sure, but not symetric