Recurring Actors in StarGate SG1 and StarGate Atlantis

Has anyone else comes across a feeling of Deja Vu when watching Stargate Atlantis? That eerie feeling of "Hang on, I've seen that face before" feeling? And then you realize that it's a recurring character from Stargate SG1. Actually it's a tad more complicated. This is a classic case of recurring actors; human on Earth and Wraith in Pegasus sorta coincidence.

Let's try and spot them:

Christopher Heyerdahl -
Stargate SG1 - he was Pallan in season 7
Stargate Atlantis - Halling, notable Athosian male. Also male wraith. Keep your enemies closer huh?

Garwin Sanford
Stargate SG1 - quiet alien by the name of Narim
Stargate Atlantis - Elizabeth Weir's husband

Ona Grauer
Stargate SG1 - Female Ancient found in the ice, aka Ayianna.
Stargate Atlantis - was part of flashback to Earth, when Ancients left the Atlantis base.

Craig Veroni
Stargate SG1 - Weapons officer.
Stargate Atlantis - Dr. Peter Grodin. He dies when trying to fix space weapon?

David McNally
Stargate SG1 - One episode he was Hanno and in another he was Simon.
Stargate Atlantis - Avrid. His people lived in a sanctuary helping those ascend.

Paul McGillion
Stargate SG1 - Young Ernest Littlefield.
Stargate Atlantis - Lovable and now quite dead Dr. Carson Beckett.

Dan Payne
Stargate SG1 - Various Kull warriors and a Jaffa.
Stargate Atlantis - Big ugly Wraith.