Well I know that unless I become suddenly wealthy and don't have to work in the next 18 months , I won't be buying any of them at launch. My Nintendo DS is enough for me right now and I have more then enough games on my current systems + PC that I still have to finish before worrying about buying yet another new console system.
Plus , there are advantages to waiting, I figure I won't buy any new system until 2007. Sure it's another couple years but by then we'll truly see what the differences are between all 3 consoles and any worthwhile games from each systems luanch will be buget priced by then + the systems could be as low as 200 bucks US a pop.
This gen I've been jewed out of cash on both my Xbox and Gamecube- the Xbox I bought a month after it came out with DOA3 and Halo and a second controller. I barely got my moneys worth out of it for much of its first year of release. Aside from the 2 games I purchased there really wasn't a whole lot I wanted that bad, and in that year better controllers were released , the system dropped 50 dollars in price and DOA3 dropped 40 dollars in price. There was also another game or 2 near the end of 2002 I wanted. I could have waited until that fall basically and saved 100 + dollars for what it was worth.
The Gamecube was far worse though, I decided I wanted one for the Resident evil remake and the next mario title among other things so I rushed into buying one at the end of march 2002, 2 weeks before resident evil came out. I hadnt' had a price drop at that point but only 6 weeks later at E3 it got one. Basically I wasted 80 dollars becuase I barely used the thing other then resident evil for most of that first year. Look at it now, I could get the system with a game and all 3 good Resident evil titles plus the other games Ihave on the system for about 50% of what I paid.
So yeah, atleast a year wait on all the systems for me thanks. It'd take a helluva a good exlusive game to get me to budge.