Welcome to Macmod.  G4 DAs are a great starting point for building a killer Mac.  If I may suggest, your next step should be a newer video card.  That will get you access to more software, more OSX features and generally better performance.

By the way, I cannot see your photo.  It may be my aging Powerbook, but if not, check the forum sections on posting photos.  If you still have trouble, feel free to ask for help.