I am thinking of getting a speaker system for my pc, i have only before had some cheap speakers which need an upgrade, i am hoping to spend around £400 on it but have very little idea where to start, i vaguely know how to connect everything together but i need to know which products would be good to get , i want to get a center speaker at some point but not currently so it would be good if you could use a 5.1 channel amp, Thank you for any advice in advance