What do get? What to get????

I have these books in my cart at ARe. I can get on of them for free. Which one will it be?
Any suggestions?

 

I am down to two 

   
Gambling Heart   
Sweetwater   

 

Mammarella

Currently reading

Best Kept Lies
Helena Maeve
Brethren
W.A. Hoffman
Progress: 3 %
The Virtu
Sarah Monette
Progress: 30 %
Orochi no Kishi
Itoshi, Lehanan Aida
Progress: 80 %