ADDITIONAL COMMENTS: I want to make a PC to play some games and for photo editing. I'm about to buy a Q6600 as the processor unit. I sill have my doubts about the PSU because I know nothing of it as well as the case for all that. As for the audio, I'm ok with the built in of the motherboard. I think that is pretty much like it.
If someone could give me a hand in terms of the power supply and the other components, if they are compatible or not, I would like to know. In case some other information is needed, I will post it as soon as I can.
Here is an AMD3 build that should be compariable with your Q6600 build but provide you a more future proof system. I have added a case and DVD drive to my list since you didn't include them in your already have list. If you don't need them, than that cuts the cost down and you could look to add a second graphics card in Crossfire.