That skimmer just needs some TLC! (unless of course you are really wanting a new skimmer). However, being a part of the euroreef fan club (TM) I should say that it really is an awesome skimmer and you'll spend quite a bit of money to find a skimmer that outperforms it.
Grab the venturi from global designs and paste some silicone over that little crack. As for the part on the pump (which I think the venturi will be attached to) my pump ran looking like that for 3 years with no problems
