First, I want to extend much deserve thanks to zen.state on his replies to my pm's.
And to add, I have decided on getting a couple of 21.5" Acer G215H instead of bidding a 23" Al ACD on ebay. More screen real estate for less the price and it is brand new.
As for my ATI x1900, I figured that I don't have to put too much effort on this not functioning x1900 that I bought from ebay. Life is like a box full of chocolates, you will never know what you will get.
Is the x1900 cooling fan that loud? I really like a quite system. I am looking into an nVidia GeForce 7800 GTX 512MB for this DC 2.3GHz G5. Since these cards have coolings fans in them, it would not guarantee a quite operation am I right? If it will be louder than x1900, then I would stick with the former.