I would just skip the Emperor. Those types of filters tend to lead to high nitrates. Which is fine in a fish-only system -- fish can tolerate nitrates, inverts cannot. If you are considering doing a reef setup down the road, then I'd advise you to get the right equipment from the start. A protein skimmer and live rock will be all you need for filtration. If you do get the Emperor, all the cartridges and filter pads will need to be cleaned regularly, about once a week. If this sounds like too much work and hassle, then go with a protein skimmer. They require very little maintenance. I clean mine about once a year.
What is the acceptable range of nitrates for fish and inverts?