If you are going to school you will probably be able to qualify for a student edition. It is the same as regular edition, but just way cheaper.
Adobe upgrades all the time so there are many features on CC that are not on CS6.
I would look at a post "changes in CS6" to see what they added.
CS6 needs a better video card, better being mid range. Best to have min. 8 gigs of ram also.
Have you tried running the trial version of CS6 for 30 days to get a feel for the software and perhaps answer for yourself the many questions you obviously have?
I tried the links and downloaded the files, but for whatever reason, they aren't installing on my computer. Also, the requirements needed by CS6 aren't an issue. I do freelance work and built and upgraded my comuter to handle Adobe programs.
I did look at the list of upgrades and at a glance they seem more like nice-to-haves only.