So, I just upgraded to Extra, and with it, the opportunity to upgrade my callsign. I'm thinking 2x2, with the the group-A's being impractically difficult to get.
I'm a very new ham and am not attached to my current sign at all.
So, what makes a good callsign? I don't know code now, but might learn it later. How concerned should I be about length in code? Are some letter combinations particularly likely to be mis-keyed or mis-copied?