First, all my systems have SSDs, love them!!!
I'm not a gamer and typical installation on my for systems is around 35 Gigs.
If planning on putting games on the SSD in addition to typical programs I do not recommend 60/64 gig SSDs, SAVE mony for a larger one and add at a later date.
You will find down stream that you wish you had bought the large and although not a total waste of mony, it would go a long way toward the larger size.
My recommendation is to catch the Curcial M4 on sale, lately it's been hitting around a $100 on sale.
What the SSD does:
.. Speed up boot time considerably - BUT how often do yo boot/reboot.
.. Programs will load much faster, But for small footprint programs not a iggy, only notice it on large programs.
.. Files will load faster, ie that largespreed sheet, or that map for games that are required while playing - This is a biggy for gamers.
What it will not do:
.. Programs will NOT run faster
.. Games will NOT see an increase in FPS
.. Files called for by programs that are on HDD, quessed it - NO improvement.
Now, a little more on size. I'll use the 64 gig as an example.
1st must subtract 4 gigs, Fact of life, manuf use decimial for counting - computers use power of 2
2nd Must leave a MINIMUM of 10 percent free, so that wear leveling, Garbage Collection, and Trim can work ther Magic - Loss 6 gigs.
Bottom Line is that 64 gig is Now down to 54 gigs. A 60 gig would be about 50 gigs usable. NOTE I used 10 %, some recommend 15% left free
My 35 gigs is AFTER appling space saving tweaks such as:
.. Disable hybernation - save an mount equal to ram, so for 8 gig system saves 8 gigs
.. Manage swap file (virtual Memory). Windows by defaul will use about 1 1/2 time ram for page file. You can set min and max to same value (I set mine to 1024 mbs) this save about 11 gigs (for system with 8 Gigs).
.. Reduce size that restore points can take, or disable restore points. This directory can be quit large if unmanaged.