Oh no, by no means is one company better than the other. I merely state that currently I like the ATI M9 as the mobile card and the Radeon 9000 as the desktop card that I would pay for, it was simply my opinion. Nightshade gave his, and a few others did as well. There is never a right or wrong with these things :-) and by no means did we intend to push anyone either way (I didn't, at least). I hope you'll forgive me if that's how I sounded.
As far as the M10, you don't need to wait for it if you don't want to, it just depends. I would say a few months into next year, ATI will have the M10 out and it'll be a card with maybe more memory and an AGP 8x interface. Those things are not essential to games nowadays, and definitely not for the older games (Counterstrike, for example). Many of the members here play UT2k3 with much success, so it's definitely a great card. However, if you are looking to play Unreal 2 and Deus Ex 2 and things that come a lil while after Doom 3, you will probably have to start lowering the settings slowly as time passes, but that is as it is always. Waiting for the M10 means you'll bypass that for a time and then be faced with the same issue, that is ALWAYS the case with computers.
Replacing the graphics card would be ideal, and that is why I hope sager considers making the card removeable, but I highly down they will ever offer a mobo replacement. I expect it would cost more than it is worth and they won't offer it simple because there may be major changes to the motherboard in the future (ie: hyperthreading). If you buy the current top of the line Sager, you will be happy playing games for at least a year, and if you lower our settings a lil and aren't insanely picky, you'll play games for a long while more. The computer otherwise (besides the graphics card) will serve you more than enough for a long time to come if you're just doing the standard windows/internet/word processor. For that, it will prolly last several years at least. :-) Such is the issue with computers, we just have to deal with how technology flies. Most software companies do make their programs fairly "backwards compatable" and thus you will not have as much trouble as people in the past have had.
Hope that helps!