Transformer1 or Transformer 2?

If you can wait then wait, I'm not expecting it any time soon though but I could be wrong.

 

Unless the quad-cores provide much better battery life, or being sold at the same price, I don't see people jumping on them. The dual-core Nvidia machines out there right now are quite fast, and it rarely feels like I'm waiting something to happen (due to speed) with any app for me.
This will further improve assuming Ice Cream Sandwich (next version of Android) will be available on the current tablets, as it will make use of hardware acceleration, which is supposed to increase their speed substantially.
So your answer: no, I wouldn't wait, unless you know it's coming out next month, and will cost the same

 

I have heard October, but we all know how that goes. I also saw somewhere that it was going to be a Tegra again, 1.5 dual core, could be more talk though.