I have to agree with seaham on this one. I originally purchased a Prizm skimmer for my 75 gallon because it was inexpensive. It was rated up to 100 gallons(i think). I'm finding out it just isn't doing the job, plus its a hang on which bothers me more than I thought it would. Now I am looking at Turboflotors that are over 200 dollars.
I also originally went with an Eheim Professional II canister filter, again to save money. After about a year, I spent even more money to switch to a Tidepool II...which has made me way happier.
All of these changes still came after a ton of research before even starting my setup. This is one of those hobbies that you just don't know exactly which direction you are going to go or what tweaks you will have to make until after everything is running and in place.
It's an awesome hobby..pennies well spent, but save up and do it right.
You owe it to your fishies