1. The 5600 Go is a fantastic video card. As of right now, it is the most powerful and the most fastest card on the market. With the Toshiba using default drivers it easily scores 8500 on 3dmark 2001. Keep in mind you should take 3dmark2001 scores and maybe even 3dmark 2003 scores with a grain of salt now , considering alot of the false benchmarks and driver tweaking we have been seeing. I have heard that some are using the desktop drivers to the 5600 for the 5600 Go without any problems causing the benchmarks to go up to about 8800 to 9000
2. The 5205-S705 blows the current 5670 out of the water on almost everything . LCD screen, graphics processing power, and it also has the yamaha kardon speakers built into the laptop along with the subwoofer making this quite a great laptop to pick up .
3. If you didn't know this already you aren't going to find a laptop with as much pure processing power as the Sager's and that is final. There isn't anything to really debate about. Sager's are mobile desktops , they aren't advertised as thin and lights.
THe new Sager's are going to give the TOshiba a run for it's money. It's really all about priorities and what you would like to have vs sacrificing for something else. If a superior LCD screen, and audio system are important for you then the Toshiba is the right machine.
As far as the 5600 Go and M10 being better then one other, that is yet to be determined. I have seen just as many posts showing the m10 conquering the 5600 go as I have vice versa.
I do know that Nvidia and ATI both make quality products regardless of what's someones personal affiliation may be. Either way you are getting a damn good video card and I know the 5600 go will take future games just as well .