In my experience you have two types, the USB docking station and the one that the laptop will actually fit into. Normally the later is for business laptops and can be had for about £100 British pounds, the USB ones are normally cheaper.
Obviously the full docking unit is better as it provides easier docking and will also charge the unit as well as possibly introduce ports such as serial or additional USB, DVI. The USB offer much the same but are clumsier to dock with and would not charge the laptop.
Both as a minimum should allow for Keyboard, Mouse and monitor to be permanently connected to the docking station.
I do not know what model you have but this one looks like it will tick all the boxes.
http://www.pcupgrade.co.uk/productdetails.asp?ProductID=2675&categoryid=401
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