I even searched the net and read various forums. At the end, I came up with the conclusion that Kaplan is the best. I went to amazon and ordered the following Kaplan books:
1) Kaplan verbal
2) Kaplan math workbook
3) Kaplan GRE 2011-2012 (main book)
4) Kaplan flash cards
I am taking the GRE this summer, so won't be able to fully stand by these books until after the scores are out. This is just my personal opinion. Hope it helps.