I don't know too much about BYU acceptance rates and who is more likely to get accepted. I feel like returning has a missionary would give you some sort of leg up. I got accepted to BYU Provo as a transfer for Winter 2011 and I had a GPA of 3.18, I think with a 3.59 you should be fine because I know a girl who got accepted as a freshman (which I've heard is a much harder feat.!) with a 3.5
Just do really well on your essays and it looks like all your credentials in place! I think thats the only reason they accepted me haha! Competitive GPA is 3.3 so you're fine!