Your PC probably won't pull more than 350W or so at full load. If you already have the CM EP+ 600W it will likely be sufficient. I personally wouldn't put a $1000 CPU/GPU combo within a mile of that PSU.
and if i added a water cooler like : corsair h60 and an lg dvd rw+ ?!
also i'm using a mobo that has 4 fans inside, 2 intakes, 2 outtakes..it's the NZXT Lexa S if you know it..
should it still be sufficient ?
Fans are a couple of watts each, the H60 is a few watts and the DVD is max 25W; most of that is considered part of a standard system. So yes, it is still sufficient. I would still upgrade your PSU to something like the Seasonic M12II-520W.