[Hardware Question] SSD just for the OS?

[Madfish]

3. I was intending to use the SSD for my 'Flight' Drive (FSX at 17Gb including the SDK and IL-2/mods at 13.6Gb hopefully leaving plenty for SoW). These SSDs are quoted at something like 'up to 355MBps' vs my existing 93.5MBps. Would a new HDD really be better?

If I understand you right you're asking if it was better to use an SSD instead of a regular HD. The answer is: depends on money.

One thing is for certain: If you go for a small SSD then definately put your OS on it. Not the games.
If you want to spend some money either get a bigger SSD or don't get an SSD at all and spend the money somewhere else (2nd GPU/better GPU, bit more Ram etc.).
Games do not run noticably faster / better on SSD. There are only a very few games that really run like 1% faster and load 10-40% faster. But once loaded you won't see any noticable difference anymore. (I linked a review about that in an earlier post but you can just search for one yourself)