MK easily. GT5 will sell around 3M, maybe a bit more if PS3 sales really take off. MK will double that.

 Wireless sukcs... I know how you feel, my gf has wireless, running from the exact same connection and modem I use. Her ping is ludicrous and it drops out all the time, while mine is stable throughout.

 Have you played the ds version yet?  I'd have to say that's the best version.  Even though it's entirely opinion, I think most people would agree.

I definately like the Ds version more.

I liked the Cube version, but I would say it was my least favorite... SNES was my fav, but again that nostalgia thing may bias it a little

Gran Turismo by a mile. This game will most likely hit in late 08, during the Holiday season. Remember, Gran Turismo sells very well in all territories (including Europe). This series sells almost as much units as Gran Theft Auto series.

The last Mario Kart sold only 6 million compared to GT 4 8.79 million. Also GT games sell well when they make their debut on a next gen console.

Also, When GT 3 hit all three regions, The PS2 userbase was only 12.3 million, and it managed 14 million lifetime.

MK, and this is without any fanboyism, Double dash was one of the cubes biggest sellers, and Mario Kart DS was a massive seller on that system as well

So everyone is saying that Mario Kart will sell almost as much as Grand Theft Auto? Because Gran Turismo and Grand Theft Auto numbers are close. You have got to be kidding me.

i love mk ds better than mk gc, but as someone said it's just opinion but i think mk will beat the ass of gt 5, because of the casual player, even the chics will love it

MK. Based on console install base and awesomeness of Mario!