Thank you all for the input! SPECTRE sounds the most promising to me. I think I will go that way.
I was going to say SPECTRE for the resolution mechanics and gear, PLUS the Black Ops'
STEALTH RULES and
SCENARIOS that are easily transported to ANY game system!

(and the perfect excuse to build SIX different and gorgeous game tables with lots of scenery!

)
Please let us know about your progresses in the "Modern" field!
