Should I take the new GRE in Sept or take the old one this July?

Hi and welcome to my blog,
I opened this blog to help anyone who is preparing for his GRE exam.
I remember myself when I started - I was so lost and in such a panic.
Luckily I got this great Gre guide that helped me a lot
So study hard and good luck!
I am planning on going to graduate school in the fall of 2008 and need to take my GRE sometime between now and October. However, the test is being completely revamped in August and it will no longer test the old material. I had originally planned on studying this summer and taking the test in August, but it is no longer offered then and the new study guides won’t come out until mid-July. Should I take the old, time-tested version, even though I won’t have as much time to prepare for it as I feel I need, or should I take the new version this September?
Any advice or insight would be greatly appreciated.
I’d take the old one just because there are study materials out there. Plus I wouldnt want to be the guinea pig for the new test format.
Took the first new SAT, it wasnt fun.