Thanks for all the great advice guys. Much appreciated

I got 37 in verbal and 48 in quant. considering im an intl student with an engineering background working as a financial analyst, its totally logical. I guess I can push my quant to 50 but the verbal is where i can really bump my score.
as for how thoroughly did i prepare. I just completed the Princeton Review gmat book and the 2 free sample exams from mba.com. I studied for a total of 25-30 hours
What woudl be the best book/prep material to boost my verbal score? would
mgmat help?
I've also started reading the gmatclub gmat threads and they are quite useful