a reef tank needs at least a lb of rock per gallon imo, so if it's a reef tank you are trying to shoot for, that's a good basis for the filtration. the emperor and even the skilter (which i use) are good supplemental filters, but the basis of biofiltration should be in the live rock and substrate imo. every one has different opinions, of course, but the question being best all in one filtration sys, the only "real" answer is live rock imo. the skilter models have a built in protein skimmer, which is another plus if you don't already have a skimmer. it's basic in design, but for a small tank or with an oversized filter it should suffice. i would recommend the 400 though for your size tank. it's best to over size a bit for whatever you get.
the emperor is a good choice if you like the ideas of the wet/dry setups. my roomate started his 55 with an emperor and a skilter 400 (which is where my skilter comes from =), and he had no proba with this setup. he eventually moved to a tidepool wet/dry sump. there are lots of choices you can go with. filters are basically all the same, just try to buy one for a size rated at least double your tank size for best results. just my opinion though, good luck and happy reefing!!