thanks agains for your answer Joel !
about Intel I've wondered a lot and made my decision a while back, but thanks for the input.
About the O/C, so it would be 20% more money on parts for arround 10% more power in Ghz and big electric bill and quicker use of the parts because of stress ? doesn't seem like a good deal but maybe I get it wrong ?
Also, if no O/C, is the stock ventirad ok for rendering ?
PSU should be what I find in spare parts in the hacklab of my friends, like for the hard drives.
feeling more confident about my choices and your options, thanks!!