The aquaeuro usa are just octopus skimmers under a different name (made by the same company) and they are quite cheap (for now, octopus prices went up after they were shown to be effective). I have looked over many models and they all have excellent build quality. The pumps are not the best, but not the worst either, they are also inexpensive. The only mod that I am advocating is a mesh mod, that takes a few bucks and ten minutes to perform. I am not sure why all the needlewheel/pinwheel skimmer manufacturers don't do this to all of their skimmers out of the box, it is cheap and really increases performance.
I looked over some downdraft/becket units and was really interested in an aerofoamer, but the pumps needed to run them are quite large for a decent sized unit and the total cost put it out of my range.
To equal the AE skimmer you would proabably need an etss 800 unit, and a large pump. You could get two + AE classic 400s for that price! (of course you would need a tanker sized sump to put them in), but you get the idea. I have nothing against ETSS type units, and for really large tanks they may be cost effective, but for smaller ones they do not seem to be.