i would try to keep in mind a couple things while looking for a good skimmer
are you looking for a hang-on?
what kind of space you have for the skimmer?
under the stand? how much heigh do you have under it?
in a sump what is the foot print of the sump area?
do you need it to be an external or internal skimmer. with some of those answer , i am sure someone can better help you out.