Take a look at Aquatop and SunSun
Aquatop and Sunsun are up and comers with some great products. They are essentially the same brand. Some of the plumbing parts aren't so good, but the filter assemblies are built to last.
SUNSUN HW-304B 5-STAGE AQUARIUM EXTERNAL CANISTER FILTER w/9W UV STERILIZER 525G
This is not a bad filter. The rating is for something much larger than what is sounds like you are looking for, but I think that you can not really have too much filtration. And with the capacity of this filter you can easily keep it if you upgrade your tank. The other thing is that for $89 on ebay, even if the filter isn't good at its rated tank size of 175g, you know it will easily handle the bio load on a tank half that size.