7970 now or 7970 Ghz edition later

Hi guys, I am thinking about building a PC soon = I5 3750k + Radeon 7970 Ghz edition, but since I am from Thailand, the Ghz edition is not available yet, and I dont wanna order it online because I wanna be able to claim the product to the local shop as warranty. Here are my qestions:

- Should I wait for the 7970 Ghz edition or should I go ahead and build with 7970 OC
- Is there any big difference between this two cards, where can I find the benchmark?
- Since I will not use this computer until January (currently abroad) so should I just wait?
- Will the price of 7970 and/or 7970 Ghz edition will drop soon?


Thank you so much and sorry for my bad english.