The majority of my coins are US and circulated. However I do have 2 (recently come to own) Proofs-- 1971-S Ike and 1979-S SBA type I
I prefer circulated. But if a Proof or Uncirculated would pass my way and the price is affordable OR I really, really WANT it.. I will get it
Now, since I've started to store my coins in albums it doesn't matter what grade it is, as long as the date is noticeable.