What are you using this for? Depending on the use, I'd only go with 2x4GB RAM, get a faster set, and invest the money in the GPU.
Skip on the F4 and get the F3; it's a much faster drive (7200RPM vs 5400RPM is very noticable).
If you're going intense gaming, I'd stick with a CPU cooler (one comes with the CPU), but get something like the Coolermaster Hyper 212+. It's cheaper and does a better job. You could also back down on the case if you wanted and get a 912 or Antec 300 (both have great airflow).
The Corsair H50 is *ok* at best. My Hyper 212+ maxes out at 52-55C at 100% load. You can get to 4.6+ GHz on the 212. I also never hear it.
The F3 will be much faster (fastest platter drive out there), though an SSD would be the most noticeable. I'd only consider a 64GB SSD for the OS and a few major programs (like Office, and whatnot).
More RAM does not necessarily mean faster. If the computer doesn't use more than 8GB (2x4GB kit), it comes down to RAM specs. However, if your computer started running out of memory, then more RAM would keep the computer from crashing.
The HAF 912 is similar to the 922, but like $30 or $40 cheaper.
I agree on jonpaul's GPU recommendations. It does depend on your monitor resolution as well.