Usally molex fans have two molex connectors. A connection from each fan should plug into the next connector of the next fan and so on until the last connection plugs into the PSU.
I also vote for a 2nd card. 32 GB is a lot of ram already, 64 is pointless for almost everybody. You would have to be running quite a few VMs at one time to need more then 32 GB. But a 2nd card is something you will notice a difference in a few years possibly. I have no idea what requirements...
I wouldn't get one. They make some really bad PSUs and some reasonable ones, but the reasonable ones are usually around the same price as a good Corsair or OCZ unit. You can't just say, how are rosewills PSUs? Without saying which ones. You can get a Corsair CX series for the price of a okay...
Actually, google does have a desktop OS. And gaming will never be the same on a phone. No matter how hard they try, the Desktop GPU/CPU will always be better they are bigger, much bigger. So, quad core phones are very expensive and just coming out, quad cores in a PC have been around for 4+...