If you have an Antec PSU in the 1200, I'd say you're good. The SG / TP / CP lines all have long enough cables.
Read this:
http://www.tomshardware.com/review [...] 105-4.html
The 8 pin EPS to provide power to the CPU is the one to worry about. You may wanna get one just in case. I ran the one from the SG-850 out thru the hole in the MoBo tray, up the back side, back in thru another hole and just had enough flex to get the cable in the socket.
I bought the two extra fans.
I can't tell you about the Nirvana thing. I put a Prolimatech Megahalems in it w/ IS Diaomond 7 karat thermal paste. I installed mine blowing vertically up and out the 200mm BigBoy fan but day later has Prolimatech TS tell em it perofrms betetr blowing to rear of case.
You have 3 HD cages and the top 3 slots are for 5.25" drives. Put your HD's in the top and bottom cages, leaving the middle one empty and there's no problem w/the middle fan.
The case window fan "may" have an issue with your HSF. The window fan installs rotated 45 degrees from "flat" looking like a diamond rather than square. The fan is basically a round shroud "sandwiched" between two diamond shaped mounting squares. I used a dremel tool to trim the top tip of the diamond off on one side of the fan and have all the clearance I need.