OK, so I've seen an episode already of all the shows listed here...
My recommendation - Anything on USA network, but particularly Covert Affairs, Burn Notice, Psych, White Collar, or a marathonof old Monk episodes.
For a show cut short before it's time, see Chaos.
Oh, and Chuck is an absolute must see.
OK, so I'm addicted to spy shows and mysteries. What can I say. I love James Bond (Covert Affairs and Chaos), Sherlock Holmes (Monk, Psych, and White Collar) and the Saint (Burn Notice).