After looking at some suggested site, I have to say that I am now leaning towards a Pi.
The reason being is the fact it has more to offer than an Arduino, that does not mean that I am not going to get one! But the cost of a Pi, found a starter kit for £40 which includes the case, 8GB SD and its the Modle B with 512MB onboard Ram.
I know that the Arduino is not meant to be a PC but it would at the moment be something that I can easily set up, when you break the cost of getting an Arduino + Ethernet and power needs for the unit, we are talking easily three times the price of a Pi.
Without wanting to sounding rude, Arduino have priced themselves out of the market. I would need a base unit, I then would need the Ethernet Shield which does not include an SD card, so I would have to get one of them as well, power supply is another factor, adding it all up, were getting towards the £100 mark and I haven't even got a case for that price.
All I can say at this moment is I am disappointed that I can't afford an Arduino at this moment in tome or for the foreseeable future.
=(