I feel like getting one of these but I'm so confused on which one to get?

From what I know, Wii is the cheapest among all and ps 3 is the most expensive.
Sony stuff is normally very expensive but is the ps 3 worth the price?
Wii has this cool movement thingy which tracks your movement but nintendo games are normally those mario and stuff, is there any cool games like the ps 3 or the xbox 360? Cause I get bored playing childish games.
Playing online with friends on xbox 360 sounds fun, but do I have to pay extra for that? And is it worth it if I play offline?
What are the current price for these consoles? I can't find the price.

Can experience people list out the pros and cons of this consoles please?
Thanks in advance.