I would definately advise you to take it again. I think anything less than 750 puts you in the red zone, if not definately the orange zone.
I really do not think that anybody will think any less of your applilcation if you take it twice and score higher the next time. I personally took the GRE twice even though I scored a Q770 the first time.
The new GRE makes it slightly tougher to get a perfect score on the Math section but not so much so that you shouldn't give it another go. Especially if you are not going to apply until 2013, you have loads of time to schedule a test far in advance, do some solid study and nail it.
Personally I can't wait to see the new GRE admission statistics for schools that publish them. I think the proportion of 170's is going to be a lot smaller than the proportion of 800's from 2011.