Watch out for anything that has Copper in them. Copper is a heavy metal and can be very Dangerous. You can get bad with everything but you need to be especially aware of the copper pans/etc. The copper has been reported to be found in the foods cooked in them.
I like the Titanium pans because I can use my stainless turners in them but you also need to be aware that is is also a heavy metal but not as dangerous as copper. It does less damage to the human body than copper.