Which gaming laptop?

1. What is your budget? Would rather spend below $1200 but could fork out $1300

2. What is the size of the notebook that you are considering? 17.3"

3. What screen resolution do you want? 1920x1080

4. Do you need a portable or desktop replacement laptop? desktop replacement

5. How much battery life do you need? doesn't matter

6. Do you want to play games with your laptop? If so then please list the games that you want to with the settings that you want for these games. (Low,Medium or High)? Skyrim - med high, Minecraft - maxed out, MW3 - med, Black Ops - med high, Portal 2 - high

7. What other tasks do you want to do with your laptop? (Photo/Video editing, Etc.) Multitasking

8. How much storage (Hard Drive capacity) do you need? Only want one HDD so I can later upgrade and add a SSD

9. If you are considering specific sites to buy from, please post their links. www.newegg.com www.tigerdirect.com www.pro-star.com

10. How long do you want to keep your laptop? 3-4+ years

11. What kind of Optical drive do you need? DVD ROM/Writer,Bluray ROM/Writer,Etc ? Need a DVD Writer, would like a Blu Ray

12. Please tell us about the brands that you prefer to buy from them and the brands that you don't like and explain the reasons. Asus - cool design, good cooling, easy upgrade MSI - cool design, easy upgrade, nice keyboard

13. What country do you live in? US

14. Please tell us any additional information if needed.

There are two laptop's in particular I was looking at, the G74SX and MSI 780.
MSI - http://www.pro-star.com/index.cfm?mainpage=productdetail&model=GT780DX-PS1
ASUS - http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=637440&CatId=4938
Which would be better to buy? Why is the MSI cheaper even though it has a 570m while the ASUS only has a 560m? Should I buy now, or wait for the announcement of the G75 series and see what happens?