Haven't started yet since I am still building my system, but I already bought this mouse for €22;
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Its the
Logitech MX518, found it here for a bit more money but I am sure that if you keep looking you'll find cheaper:
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As for the keyboard, I am getting this one:
You can adjust all the buttons I think, and enable a Windows Button Lock so when you prss it by accident you dont close your game

--->
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As you can see it has a tiny display, wich can show what songs you are playing or your CPU power and RAM

80 Bucks here in the Netherlands, not sure what it is in the UK but its name is the
'Logitech Gaming Keyboard G510'
Oh I forgot; The keys are lighted so you can see them in the dark! And you can change the colours of the keyboard, from red to blue to green
As for the mouse again, I love it! You can adjust your sensetivity with the two buttons that are at the scroll button

It doesnt have any lights tho, but I love it.