As of January 1, 2015, 13 SEER equipment is no longer the base SEER rating. All 13 SEER equipment is going to be phased out over the course of 2015. 14 SEER is the new base line SEER rating.
R22 refrigerant is also continually being phased out. The cost of R22 continues to fluctuate as the government continues to regulate it. You should expect higher repair costs for systems containing R22 refrigerant as well as higher parts cost.