i wouldnt bother with any of those skimmers the first one is just ugly and will need a rather large , possibly expensive pump to operate it and even then its only an average skimmer
ns- 80 isnt a great skimmer and dosent allow much room to upgrade
and the airlift ive heard they work ok adjusted properly with a grunty(noisy) airpump but they have there own problem like small collection cup and having to replace the limewood airstone often, not to mention micro bubbles, all that aside they are only suitable for a really small tank or a tank with next to no bioload