If you go with a Euro-Reef you can't go wrong. They are among the very best skimmers out there. They are a bit higher priced then others but IMO
they are worth the extra cost! For a lower cost similar skimmer the ASM series is a good option. AquaC makes excellent skimmers as well especially for inline use! You could easily pick one up on ebay for a lot less then you would pay if you ordered one from them.
As I said before what ever you decide make sure to research it and spend a little money, you will be glad you did in the long run! Cheap usually means "Cheap".