Buying 360, DS, PS2

I've just gotten a large sum of money and I'm wondering if you could give me some links and tips about how I can modchip them or what do I do with R4 or M3 which I've heard is better, I've also got a Wii I want chipped.Basically all I need is some links but if there is any problems you've ever had could you tell me how to avoid them?

if you chip an xbox 360 you risk being permanently banned from xbox live

You'll need a flashcart for DS. Xbox, have no clue, modchip for PS2.