Brewskies: I'm not trying to be mean to the guy at Circuit City but he's wrong. Trust me, the docking station has no effect on the performance of the actual laptop. I'm a computer engineer with 20 years experience. They probably give those kids that come into Circuit City some training, but I doubt it's really that in depth.
I'm like you, just MS Word, Internet and generic use of my system. When you use the docking station it would have all the additions attached to it, not your laptop. The only connection to your laptop is the power cord and a USB cable to the dicking station. The Kensington station allows you to use the monitor from your laptop so there's no need to buy a seperate one. The printer, keyboard and mouse all attach to the docking station. If you already have a second monitor you can use it to have a dual monitor system. I did that and it's pretty cool.