Nah, just get the one big one.
There are no real benefits to having 2 SSD with this-and-that installed on them.
Even if you install programs to another drive, some of the applications data (i.e. *.dll) is still put on the OS drive anyway.
And if you have to do a re-install of the OS, you'll still have to re-install your programs/games anyway.
But, a great choice! The Intel 520 180GB is about 4 times faster than your 60GB version. But only if you have a SATA III port. THe SSD will still scale down to SATA II if not.