I'm looking for a PC to run Linux on for as cheap as humanly possible. I'm not planning to spend more than £75 on this one, and the absolute maximum is £100 (US $150). This must be possible, because this exists:
http://www.ebuyer.com/704152-exdisplay- ... -bxbt-2807
I'm sure you could the component parts of that PC plus RAM and a hard drive, for cheaper than the prebuilt price, and that includes a wifi card which I don't need.
Literally all it's going to do is run an IRC client and surf the web most of the time, but it will need to be able to stream video from Youtube, Twitch and Netflix (as well as MLB.tv) occasionally, in HD. That's the tricky bit, I have no idea what sort of hardware is required for that.
Wireless isn't required (or in fact even preferred).
My budget is: £100/$150, but as little as possible.
I live in: Devon, UK
Operating system: Will most likely be Ubuntu. Some flavour of linux anyway, so doesn't need to be factored into budget.
Monitor: Already have one.
Gaming resolution : No gaming. Native resolution of the monitor is 1440*900 (yeah...).
Peripherals?: I plan to use Synergy, so not planning on needing peripherals. I do have a spare mouse and keyboard just in case though.
Will you do overclocking?: No.
What are you planning to do with the pc?: Mainly surfing the 'net, IRC and Skype video calls, occasionally streaming video.
Any help would be appreciated.

I have looked into the Raspberry Pi, but I'm not huge on the idea of using an SD card for the main storage device. That's possibly a silly thing to be hung up on given the rest of the features it has for the price, but... meh.