Adobe CS6 is the last version of Creative Suite offered in the traditional sense. From this point forward, Adobe is selling Creative Suite via the Creative Cloud subscription model only. For those unfamiliar with a subscription-based software model, you purchase the right to use the software for a period of time and renew the lease regularly.
For CS3 and CS4 users, Creative Cloud is especially attractive since there is no upgrade path to CS6. But even for CS5 users, Creative Cloud includes the entire Master Collection, far more than Design and Web Premium. Creative Cloud for Teams adds the additional advantage of centralized management of users, a single subscription start/end date and cloud storage.
MacLab is offering Creative Cloud for Teams at a special discounted rate through August of $39.99/month per seat, a discount of $30/month. Purchase an entire year now and save a bundle.