Power supply?

I've been looking for a high power Mains to USB adaptor (something around the 1200mA-2000mA range) so its got enough juice to sub a USB hub too.

Also thoughts that went past- Modified ATX (or other format, just happen to have an ATX one lying around) PSU, giving 5V needed for the RPi, along with 3.3V, 12V, -12V etc that you might need for projects, and also rather handily, external hard drives (mine is 12V) thus cutting down on extra power supplies and more losses.

Current plan I'm wanting to go with- 5V USB supply, USB cable from PSU to power input on USB hub, short USB to RPi from hub for RPi Power and short USB to Hub from RPi so I get more USB ports.

Hope this helps

So a regular cellphone charger with mini usb will do ?

it wont be too weak or too strong?

No, the important is the current.

There aren't differences between a power adaptor o phone charguer.

A normal cell phone charger should do fine, it hardly draws any power on it's own.  If you start plugging lots of high power-usage stuff into the USB ports, you'll need a bigger charger, but at that point you probably just want a powered USB hub anyway.

Another question is: which is the maximum that can withstand RPI?
For 500mA or 700mA are to the board and very low power devices like pendrives. Or is it capable of providing 500mA to an external hard drive? In that case would have to suministre more power to the board.

On the other hand, the two USB ports are mounted on bringing hub, so 500mA port theorists are divided between the two.
I think that perhaps the model A, once it will have 256MB of RAM, is better option as it is very probable need to use a USB-HUB powered by external power adaptor.

Would i need usb hub or bigger charger if i only connect usb ssd hd and keyboard?

Most standard (cheap flavour whatsits) mains to USB supply 500mA, as that is the standard max for a single usb port @ 5V. If you are using extra devices then you'll be needing to supply current for them as well (back of my work keyboard says 5V @ 100mA, same for my mouse)

Most external HDD's have their own power, though I wouldn't much like to run one off the RPi if it didnt, too much current draw!

Think that the best (safest and most reliable) is a powered USB hub, which you can pick up for not that much more than a non powered one (just check the supply rating, then decide if you believe it)

Could try connecting it to a coffee heater / hub, tho your coffee may be kept warmer by leaving it on top of the RPi PCB!!

HTC phone chargers are 1000mA but if you want to be sure you're covered Samsung tablet chargers are 2000mA

@ lennart: Careful.  Mini USB and Micro USB are NOT the same connector types.  The Rpi is meant to be powered with a standard MICRO USB cellphone charger cable.

Will it come with al least the cable? Finding a USB device to plug it into would be easy enough.