WrongByDefault

All speakers in that priceclass all sound kinda bad honestly. But if you're just a casual user the Logitech Z623 are the clear choice. The sound may be better from the razer's (I haven't listened to them), but at this price range no speaker is perticulary good. The subwoofer on the Logitech's will help more then any Razor RGB lights.

A milliscond is a thousands of a second, hertz is a measurment of how often something happens in a second. I guess you're wondering about monitors when you ask: In a monitor hz refers to how many fps it can display, normal monitors are usually 60hz and that's fine for most people. 100-166hz is what most "gaming" monitors are rated for. If you're not a hardcore cs player then a higher end gaming monitor would just a nice thing to have, but not a must. When it comes to response time(ms) it's how long it takes for a frame to be rendered until your monitors displays it. Keep it under 10ms and you'll be fine.