Which grammer source to be suggested?

Hello all... I have lots of stuff on my computer to learn Russian. So far, I have completed Pimsleur series, Michel Thomas series and Rosetta Stone Russian I and Russian II...

I have lots of audio sources left also:
Ultimate Rusian
Just Listen 'n Learn Russian
русский язык для всех
Vladimir 2
Hugo Russian in Three Months
Linguaphone
Russian FAST
Berlitz
Colloquial Rusian
Dover - Russian - Listen & Learn

But from now on, I would like to focus on grammer in more detail before listening those audio lessons.

I have these three and most probably some of the best materials in hand. Which one do you suggest first to start with?
- Princeton Course
- S Azov (Russian from Scratch)

So, the question is with which one should I go first?

The New Penguin Russian Course - A Complete course for beginners

http://www.amazon.com/New-Penguin-Russi ... 0140120416

Hi JeffoJeff, I hate to give you one more book to get, but for me it's the best, hands down. And it's so tiny. A tiny book about grammar is a good thing. It's called ESSENTIAL RUSSIAN GRAMMAR by Brian Kemple. Can find it anywhere, I'm sure. Go thru the book and write out the example sentences onto flashcards. Good Luck!