I'll reveal my own prejudice: the problem with a thriller which you've already read is that it doesn't thrill, the second time around. So I'm hoping that Jackal, Eiger, Cold, Falcon and Firm are also-rans, because I won't feel like reading them again, heart-stopping though they might be.
Now, if someone hasn't read Alan Furst, s/he's in for a delightsome experience and possibly falling in love. Why not try someone new and current? The works I cited above also suffer from being dated. They're all pretty fusty at this point, not that they weren't great reads at the time.
While I'm prejudiced in favor of Furst, I promise to read any of the other nominated works that I didn't list.