more book advice

Hello all.  Since summer is coming up (read:  since my free time will
soon grow exponentially), and since I have a lil extra money, I've been
thinking to reward myself with a New Non-Fiction (read:  expensive)
Book.  I think I want to get something on Indo-European linguistics,
either that or an introduction to some other language family.  So, does
anyone have any recommendations?  (When I say "other language family," I
really do mean just about anything, be it Asian, African or Native
American.  I just want to read about something new to me, and
interesting.)

Nicole