Will there be a spot to connect the wire from the network card to the mobo?
and how many fans should i have in my case to keep it at a good temperature, whats a good temp? i already have 3 fans, a 80mm exhaust, 80mm intake, 80mm side intake, should i have a hd cooler?
that depends on the case your getting... and the amount of space they provided to put fans in... unless you want to do what a few of us have done, and do a little DIY to it!
but for the most part... as long as you have at least one front (intake), one/two (exhaust), MAYBE one on top (blowhole for heat), you should be good... if you can get one with 92mm or 120mm fans will mean better cooling and quieter speeds.