The speed of the network is pretty much determined by the maximum speed of the devices connected. So, if your router also acts as a switch, which very ofter is the case, you are limited to 100MBit/s because that's the top speed the switch can support. On the other hand, if you are looking to get your wiring ready for Gigabit Ethernet implemetation when you will get the proper equipment, you have to make sure that the wiring is compliant with Category 5E specifications. We have tons of information on this site about CAT5E, so please browse our pages. I'm sure you'll be able to find information on how to build a CAT5E system.
Dmitri Abaimov, RCDD