WOW!! You"re all such nerds
Only 2 real questions that need to be answered here:
1) Will I be able to buy a PSU with my Pi?
2) Will it have a lovely RPi logo on it?
As with other things, price is no indication of quality. The fact that you can buy lousy open-loop 50p psus from China on eBay for £3 today, doesn't stop you buying the same thing in a nice blister pack in a shop for £18 tomorrow. There really is no way of preventing this.
Being as RasbPi is only £25, it kinda hurts to spend another £15-£20 on a suitable PSU.
Follow up. I've just tried one of these: http://www.amazon.co.uk/gp/pro.....B003E3YQNM
It's 6 quid, and my example has a no-load output voltage of 5.08V, dropping to 5.04V at 990mA. That'll do!
I also have one of those £2 cheap ones : http://www.amazon.co.uk/gp/pro.....B002TQUDBO
That unfortunately outputs 5.6V, and is still pushing out 5.5V at 1A! Fine for charging, bad for USB peripherals.