for the little faster cas latency that you wont see in games or programs the ram is going to be more costly. with the faster 1600 ram your pc might be a little faster in real life apps. there not much of a speed gap it not like one was 1000 and the other 4000. '
before you buy ram look at the vendor supported list. some mb if you want all 4 slots filled the dimms can only be x in side and by y brands at a set speed.
Either of these are fine. The GSkill will fit under a large air cooler if you are overclocking. The Corsair will have clearance issues. I believe the low profile version of the Corsair has been linked to above. The GSkill is just as good and cheaper though so would be my choice.