Concur with above two posts.
1) Have two systems:
A) Desktop. OS + Programs on 128 Gig 830, and a 256 gig 830 for my most used Files.
B) laptop. OS + Programs on 128 Gig M4, and a 256 gig M4 For my most used Files.
2) Both systems. My OS (win 7 64 bit) + programs only take about 35 gigs. NO Games (not a gamer), But this would still leave about 65 Gigs for Games and additional Apps.
.. One big advantage of this is that I can use Win 7 back up to create an image of the entire SSD. and re-install on a "New" SSD" very easily.
.. With a larger SSD (ie your 480 gig, If used as a OS + Program drive you should partition it into an OS + Program drive and a D for your most used files (But could go larger than 128 gig for C.
.. The Samsung 830 would probably be a little faster than the Intel 520, However may not notice diff in real life. The Intel 520 uses a SF22xx controller which means that working with large data structures it may be faster than the 830 if the Files are readily compressable, meaning it may be better as the storage drive - Again not sure if you would see the diff in real life