i would suggest going with an AquaClear if you are going to use a HOB. other HOB filters, like te tetras youre looking at, rely on expensive and ultimately inefficient filter cartridges which need to be replaced regularly. this adds up to big bucks in the long run.
the AquaClear line of HOB filters runs off of a rinseable, reusable filter sponge that does not need to be replaced. it will cost you a bit more initially, but ends up saving you a ton of money in the long run. (not to mention, theyre some of the best filters on the market)