Fortunately, I got the 1600 CL7 before the prices increased. The lower power (and thus system heat and strain on the controller) are appealing but at some point the premium may not be worth it.
There is a lower priced 1.3V 1600 CL8 kit from Geil @ $112 shipped versus $115 and $120 plus shipping for G.Skill CL8 and CL7. The latter do include heat sinks though (fruity looking as they may be).
Otherwise, there are plenty of 1600 kits with higher latency and voltage $80-90.