i havnt really added anything to it that didnt come with the build already prebuilt.
it has 2 fans, 1 HD, 1 card reader and 2 drives (If thats what you mean).
I read about a power supply in this PSU guide:
A 400W forton, for $45. Nothing but good reviews.
Newegg.com - FSP Group SAGA+ 400R 400W ATX12V Power Supply - Power Supplies
i dont plan on upgrading to VERY high end video cards, just enough to run most games at decent playable FPS (Currently getting 5 FPS in most CSS maps, wishing for atleast 30+ for decent smoothness)
The only thing i plan on having is 2 or 3 120mm fans, 4gb RAM, and a decent video card.