If you find some devices you can not figure out or find drivers for - post the hardware IDs and we can help search and identify.
I looked at that website - strange, I have seen where companies charge for media sure. You can understand the cost of a recovery CD, etc. But every maker of hardware I have ever looked at, dell, hp, compaq, sony, asus, gateway, ibm, etc.. etc.. all provide the ability to download the drivers for the OSes that are supported on that model. Now if it ships with say XP, they might not list drivers for w7, etc. But that is on you if you move to OS that is not supported by the maker.
These drivers might not be the latest and greatest, and or normally maker tweaked, etc. But at min it gets the hardware working.
Let us know how it turns out - I would suggest once you find the drivers, put them in a safe place - or once you get the machine fully 100% complete take an image so that you can always restore to clean state with all the drivers already installed, etc.