What are the best grammar books for learning Pt (Br)

Please tell me! I am eager to know this language and visit Brazil! <3

Any Spanish grammar book will be enough.

Mario A. Perini: Modern Portuguese (A Reference Grammar)
Yale University Press

http://yalepress.yale.edu/yupbooks/book.asp?isbn=9780300091557

Nova Gramática do Português Contemporâneo

Celso Cunha and Lindley Cintra

Edições João Sá da Costa

Lisboa

This grammar is useless for Brazil:
Nova Gramática do Português Contemporâneo

It's excellent for Continental Portuguese tho'.

Brazilian has no formal grammar.

I fail to see how Brazilian grammar is a less valid concept than American grammar.

Brazilian has no formal grammar. /

It has, two have been released this year:
http://revistaepoca.globo.com/Revista/Epoca/0,,EMI134039-15220-2,00-MENAS+POR+FAVOR.html