Try searching for a used Euro-reef skimmers.
they are the best a bit pricey but you don't have to buy any other skimmer.
One thing you have to consider is your budget.
But remember, buy the best equipment possible so that you won't have to buy anything when you decide to upgrade in the future.
Fish/Reef keeping can be a challenge but if you have the proper equipment and patience. it will pay off and you'll be satified.
You may also consider Berlin Red Sea turbo skimmers, they are rated for 60 to 250 gallons tank.
the design is a triple pass, the only thing is they tend to clog the air inlets but I can tell you how to make this skimmer very efficient by modifying some parts.
Call Berlin, and I know they selll used units for around $80.00
Regards,
Lewis