→ Scott Kelby Breaks down the Adobe Creative Cloud Options Available to Photoshop Users

I think this is the most important part:

2: You owned a previous version of Photoshop (any version from Photoshop CS3 to CS6)

For you, Photoshop CC is $9.99 a month PLUS you get Lightroom 5 as well and 20GB of cloud storage and a Behance Prosite (custom web portfolio) as well. Sweet!

NOTE: This deal is only available until Dec 31st of this year. If you wait until after the first of the year and miss locking in this insanely low price, whining is strictly forbidden (well, at least here anyway). 

For all that you get for $10, this seems like a complete no-brainer deal. Just sign up and be done with it.