Wow, great suggestion!I don't usually foray into casting others' characters(I have enough trouble casting some of my own), but Stephen Moyer (HBO's True Blood) would make a good Pava Lar'ragos, I think.
http://i.realone.com/assets/rn/img/0/6/9/4/14094960-14094963-large.jpgSadly, I gave up my HBO subscription just before Trueblood and Generation Kill came out... which saddens me greatly. However, I did catch an episode of Trueblood while staying at a hotel recently. Stephen Moyer does a fantastic suave-creepy look that I have to admit is very Lar'ragos.
http://www.tvweek.com/blogs/blogging-the-tca/2008/07/10/trueblood.jpg
The eyes, man... it's all in the eyes.
Much better picture than the one I found.
The more I think about it, the more Moyer seems absolutely perfect as Pava. I've seen all the True Blood episodes, and not only does Moyer have the perfect look, there's a great similarity in personality between Bill Compton and Pava. Genteel on the outside... yet there's no doubt that something darker lurks beneath. 

