i need help in picking out a textbook, please

i will be graduating with a double major in general math and statistics pretty soon (next semester will be my last). i want to do an independent study on bayesian stats, of which i know very little, just the one chapter in most books. i was hoping someone could recommend one for me. i don't want to get a book too difficult (especially since the teacher i'll be working with isn't really all that well-versed in bayes), but not one too simple. Introduction to Bayesian Statistics by William M. Bolstad looks interesting, but i'm not sure where that falls. Doing Bayesian Data Analysis: A Tutorial with R and BUGS by John K. Kruschke also looked interesting. does anyone have any ideas on these, or maybe others? i do plan on going on for at least a masters. thanks.