Sorry, I somehow missed that you already have the skimmer. I don't know much about the Jebo skimmer, though, honestly I have read that they aren't great. Still, you could use it, but discontinue using the filter, if you get the additional live rock. Keep your eye on the skimmer. Once the tank is a few months old and running, you should get a good sense of whether it's skimming adequately. It should produce a nasty, very dark "skimmate" in the collection cup. If it doesn't, then it really would be worth your while to get a better one.
david...I used to have power compacts and I was fairly satisfied them. But they do have serious limitations. First of all, in terms of intensity...you want to maximize their effectiveness. To do that you, no matter what you do, will have some problems reaching the lower parts of the rockwork with sufficient light to support vigorous coral growth of any kind. But, you should be aware that PAR value of the bulbs is critical, here. The actinics have a lower PAR value than a lower Kelvin-rated bulb...like a 10,000K bulb. For that reason, since you don't want to lose all of the actinic value of the bulbs, I suggest you replace the actinic bulbs with 50/50s, which would increase the overall PAR value of what you'd have. It would be beneficial to add even more bulbs if you have room, on top of the tank.
The number of watts per gallon is just a rule of thumb, which is more useful over a freshwater planted tank than it truly is over a reef. So, maximizing the effectiveness of the bulbs is more important than just reffering to the number of watts per gallon alone.
Power compact bulbs barely penetrate more than about 17 inches and I'd say that if you do what I suggest concerning the 50/50s and even more bulbs, you'd be able to keep hard coral on the top of your rockwork only if it goes high up, and the lesser light-demanding ones only, like pocilepora and hydnopora.
