So just scratch up another 30$ or so and get a i3?
It will just hold me over a few months and get a 3570k for Christmas.
If you're just holding on until Christmas, I would say hold onto your money and wait until then. You would see a slight increase in performance upgrading to a Pentium now, but it wouldn't be worth $110 IMO.
What motherboard comes with the offer? If it's an OC ready Z77 board, then I would say take it. Otherwise, invest the money into a GPU for when the time comes to upgrade to the 3570k.