you will be able to add the inhabitants and rock from the small tank right after the cycle. i don't see it taking more than a month.
i don't know how you added livestock safely to your 100 liter tank after a couple weeks.
as for a protein skimmer, do you need an in-sump skimmer or will you be purchasing a hang-on style unit?
if it's the best hang on unit, i would go with something like this:
Super Reef Octopus LX2000s Hang-on Protein Skimmer
for heaters i would go with a pair of smaller heaters instead of a single, large one. the idea is if one fails, the other will maintain the system until you can address it.