I am in my 3rd semester of Arabic....and we are using a great textbook. It is the Al kitaab series by Kristen Brustad, Abbas Al-Tonsi, and Mahmoud Al-Batal. It's pretty easy to follow, and there are DVD's to follow. It focuses a lot on grammar, sentence structure...etc...
Here's a link:
http://www.amazon.com/s/ref=nb_ss_b/002 ... =Al-kitaab