It really depends on what kind of keyboard and mouse you want. For the monitor, I would go with this: http://pcpartpicker.com/part/hp-monitor-23xi
It's a decent monitor and it's an IPS panel with built in speakers. This way, you don't need to buy sound speakers and it will look better than a regular TN panel due to it being IPS.
It really depends on what kind of keyboard and mouse you want. For the monitor, I would go with this: http://pcpartpicker.com/part/hp-monitor-23xi
It's a decent monitor and it's an IPS panel with built in speakers. This way, you don't need to buy sound speakers and it will look better than a regular TN panel due to it being IPS.
That leaves you with around ~$100 for a keyboard. For the keyboard, there are a lot of options. It really depends on your preferences. Do you want a mechanical keyboard (higher quality, feel better, lasts longer, but more expensive)? Do you want backlighting (what color)? Do you need macro keys?