Buy This Console
Sales
If of course you are looking into sales (which I am not) then Wii comes out on top. This console has easily been their worst yet and this comes from someone who owns all of their previous entries. So why is this?
The major reason why is simply because they do not give a damn about all of the past fans that made them money before the Wii, the majority of new games are aimed at idiots and Nintendo fans rarely see the light of day. Mario Kart Wii was at best disappointing as they seemed to take out everything that made Double Dash good. As well as this they are copying Mario Galaxy by adding in a few variations to levels in Mario Galaxy 2.
The Wii (in my opinion) is certainly out of it already.
Online and other
It cannot be said that the PS3 is a bad console with games such as Uncharted proving just how good the console can be. However, online, although free, is slow, poor and features many people who cannot even speak English within it. I do not understan why they did not add language filters? Is Blu-Ray the only decent thing going for the PS3.
It would certainly seem that the Xbox 360 has the best online service, the best games and the bettter experience. Do not get a Wii as although it is said to be for the entire family, the kids and you will get bored quickly. 360 or a PS3 is the way forward.
To make sure these will not have to be replaced for some serious money, get game console insurance or gadget insurance. Of course you could also get some mobile phone insurance while you are at it.