New PC

As I turned 17 today, I thought of some things I would like to get for my birthday. I've been trying to save some money as well the past few... erm... days :P. So I asked some more money for my birthday so I will be able to buy a PC. Now my question is, what is a good buy for around 300-400 euro's? or is that just not enough money to buy me a nice gaming PC (it doesn't have to be all that good, would just like to get a steady 76 @ ET or smth).

*edit* Don't need monitor or keyboard/mouse, just a PC.

thx.