Do all that, and you will not notice increase. Instead get small size Vertex 2 or better so u have 2 ssd's and install system on 1st and aps,doc folder on 2nd + share the page file with both ssd's.
more memory is always good . Also u will see 20% improvement. Want more?The Sandy Bridge i7-2600K + Nvidia CUDA +16GB RAM total All OC and maybe u will see 30/40% improvement from what u have now. And only on large images (25MB+)with rendering.
But on small images you'll save couple of seconds or less. I tried lots of it. Now, ssd and CPU's are fast compare to HDD based systems.I would save that money and upgrade next spring.(more Intel CPU power is coming)
On a 64-bit system I can't think of a reason you'd ever want to use a RAMDisk. Windows 7 caches disk operations in RAM, which gives you the same benefits of a RAMDisk. All a RAMDisk does is to limit the amount of space Windows has available for caching I/O to other files.