It would cost over $1,000 to upgrade the Creative Suite from something that old. It costs $50 a month for Creative Cloud. I think CC is much cheaper.
You are long past any upgrade cycles, so pardon me, even thinking about it is utter nonsense, even more so since Adobe ever only have allowed a two version back upgrade policy and only sold whatever was the current latest version. Conversely, if you are a student there are discounted CC plans and while it's still money, I don't think 199 bucks for a full year of the full CC package is too much. The rest is answered here:
If you really, really, really want to pay a huge chuck of money for outdated software, you can still purchase CS6. See this page: Creative Cloud now includes Creative Suite Master Collection and Design Premium features
But when they quote you the price, compare it to what you would pay for CC.