A couple of caveats.

1. SSD's have a limited function span. Each read/write to a specific address does atomic level damage to the semiconductor. Know how high use USB sticks suddenly die? SSD's will do exactly the same thing. All the claims of functional equivalence with traditional hard drives are based on -common use benchmarks- (ie: Office work and average online use). Not the kind of intense use that something like CGI or cluster based number crunching will inflict. Yes, they will ease the choke point that HDD access is, but if you plan to use them I would suggest installing a couple of old fashioned HDD's and backing up your runtime(s) and any other mission critical data to them regularly. When an SSD begins to fail, if you have something like S.M.A.R.T. enabled, then the OS keeps track of the bad bytes...at least until you lose too many or an entire row of addresses. But if that bad byte is in the wrong place, it can render whatever resource its involved with useless, broken, or simply gone so far as your system is  concerned.

2. Heat. When you start talking upgrading an existing system, you have to consider just how many more watts the new parts pull, and how much of that gets released in the case as waste heat. After creating a scream machine, you do not want to unintentionally fry it.