a good way to get pricing and what not is a System Build - PCPartPicker it allows you to adjust for country and then pick parts within your budget specific for your build. Best prices 95% of the time as well.
This is with the parts already selected that you won. Now it has compatability with your mobo so just find something in your price range for cpu,ram,hdd or ssd, and monitor http://uk.pcpartpicker.com/p/MJ6ndC
Also when it comes to screens anything AOC is going to be sufficient and cheap. Plus they have great customer service. My monitors were out of warranty by 2 months and the power bricks went out on them from a power surge. They replaced them free of charge no questions asked.
