That should be enough for your paludarium, though I am not too familiar with those lights. The plants you've chosen so far should do pretty good in that setup. You said you wanted a waterfall, in the wild tha is where Java ferns and Java moss grow so they would both do well securely attached to the rocks of your water fall as well as submersed. You may also have luck with riccia or pelia slightly emersed in the areas with higher light. For the fully terrestrial areas of the tank you can grow java moss pretty easily also and terrestrial mosses. Some other plants you might like for the terresrial areas are Ficus sp.s, pothos, and wandering jew which all do well in low to high light and if given the opportunity can also grow well with their roots directly in the water and work as an extra nutrient sponge. Although not very natural you might find some places to attach some tillandsias. Some orchid species might work also. I really like growing Cryptanthus species in terrariums also.