Harn is quite solid. I'm also waiting to see what the new Top Secret looks like, as I was a huge fan of the old one (not, I should mention, Top Secret/SI). The James Bond RPG was a fun, over-the-top system that was also very flexible in terms of play and could provide quite a bit of fun depending on the nature of your group. The same goes for the old Gangbusters system.
(in case you can't tell I do a lot of non-fantasy RPG stuff...some of the best systems are actually in that genre IMO)