SslagleZ28: I have not tried to game with the case closed as idle temps were 60 with case side off it idles about 44 and goes upto 60-70 when gaming thats normalish i think. but 60 idle deffo isn't so never tried gaming. fan speed was left as it is when not over clocked. everything else is maxed out.
XLR8: i will be using the A70 corsair on a 1st gen i7.. not the best cooler but was all i could get with the left over money i had. Though i'm think of getting water cooling when i get abit of spare cash.
That's more than likely your problem. When you installed the drivers, there was a program called CCC, Catalyst Control Center. When you open it go up to to the top left hand corner click on "Graphics" and and then ATi Overdrive. In there you will see overclocking options, and a fan control. Put a check in the box for "Manual Fan Control" this will allow you to adjust the speed of the fan on your GPU. Turn it up a little, until you get your case, roughly to about 35-40% it will bring your temps down. When you get your Phantom you can keep it at 20% for normal use, and when gaming throw it up to 70-80%.
The Phantom is a great case.. The problem out of the box is that its has too much exhaust and not enough intake. Before buying a 2nd 200mm fan for the top I suggest getting a high CFM 140mm fan (a 120mm fits as well) for the front to bring cooler air into the case. Something roughly 100-120cfm. You will see your gpu and cpu temps drop alot. Whats lovely about the Phantom also is the integrated fan control that which will take up to 20w per channel. You cant run they extremely high cfm fans from delta off of it, but normal 120mm 100+ cfm fans work great with it.
Right now Im running a Scythe 1700rpm 140mm 93 cfm fan in the front blowing in, the 2 stock 120mm on the side blowing in, I replaced the 120mm exhaust fan on the back with a Scythe Kaze Slipstream 120mm 1900rpm 110cfm fan, and have the stock 200mm fan on top as exhaust as well. With these fans and a Xigmatek Dark Knight CPU cooler, which also has a Scythe Kaze Slipstream 120mm 1900rpm 110cfm fan on it, my CPU temps with a 4.3ghz overclock at 1.544v (stock is 3.2), doing normal activity I sit at 37 degrees celcius, underload i rarely break 50 degrees, and as long as my GPU fan is on at 70% it never overheats as well.
NZXT could have gave you the 140mm fan in the front but didnt

but with it the case is cold, you can stick you hand in there and feel a difference.
I know this is alot of info but I hope it helps. Its a great case for the price, and with an added $10 fan its and unbelievable case for the price. Also the cable managment is pretty damn spectacular. I post pics in this thread with the fans, and the cable managment.
http://www.computerforum.com/190351-new-fans-cleaned-her-up-little-pics.html