So I have a few external HDDs right now. All are in E-Sata/USB2 enclosures, so I am abviously using USB2 with my iMac. Well, I have an opportunity to pick up some bus powered USB3/FW800 enclosures for 2.5" drives at a super cheap price. My question is, if I run 3 or 4 of these all on bus power, will it overload what power the imac can send to each port? I know its plugged into the wall, but there seems like there might be power delivery issues. My goal is to slim down what is on my desk AND remove things that are physically plugged into the wall. Thoughts?