is dependent on the design..
I would agree that a good branded (or well praised model) would be a much better alternitive.. a wet dry can be a good thing but setainly will not do the same job as a good skimmer (of course you knew that already).
there are alot of good brands out there right now..
euro-reef, ASM, turboflotor are all good brands..
as far as bang for your buck.. look into Coralife's needle wheel super skimmers..
there are some great threads on RC with exellent results with this skimmer..
I recently posted a link to CSS in the deals thread if you would like to check them out.. :P
from what Ive read the model number is about double high capasity so I would stick with that.. the 125 model would be killer for your 50gal.. :P