[H] Warhammer Space Marine + Homefront + RF Guerrilla + Stalker + ... [W] Echelon Pack or POP Pack

I have keys for these games:

• Warhammer Space Marine
• Homefront
• Metro 2033
• Stalker: S o C
• Red Faction Guerrilla
• Red Faction Armageddon

I'm looking for changing all of the above keys for:

• Splinter Cell Echelon Pack
  or
• Prince of Persia Complete Pack

:)