@klem - maybe you should open a seperate thread
Anyways, games won't run smoother because they're on an SSD. Games also don't depend solely on their game folders content. The keyword here is IOPS. In- and Output operations. If you have nothing else than the game loading a regular mechanical disc is hardly slower than an SSD. Where the SSD really kicks in if the OS is loading components, messes with the pagefile etc. while the game's loading.
The biggest boost in perfomance will come from an OS on SSD. Games don't profit close as much as the OS from SSD storage.
Even Samsung testified that the average gain of LOAD TIME decrease is about 5% in fact it's 4,4 compared to a 10k mechanical disk. However, they didn't write anything about a ~5% FPS increase. Yes, if the game loads textures in the background you can gain a minimal performance increase but NO where near to 5%. Maybe 1% max. Usually it's an FPS or 2. But even that would be rubbish compared to the FPS increase you could gain by buying a better / 2nd GPU for that money spent. You could easily gain 30% or more by investing that money into a multigpu or high end gpu solution.
Let me explain it differently. If you have the OS on a seperate drive and the game loads from a mechanical drive that load time WILL be fast. However, if you load the game, load a new level and maybe record a full size FRAPS video to the same drive then things will get messy. That's something you could improve with an SSD but then again, do you know the size of 1080 fraps movies? ;P you'd fill up your SSD within 10 minutes.
So yeah, get an SSD big enough for the OS or big enough for the OS and games or just keep the money as it really won't affect game performance at all. There are better ways to spend money than an SSD for games.