From what i have seen.. They all pretty much do they same thing. I would try to get the one that weighs the least. I have an aluminum one that is really easy to move around. I also have one from sunsystems that is very heavy. Its made from steel.
super sun from sunsystems. lensed, aircooled, latest-greatest hood from SUN. i have 2 x 1000w and really like them. but they do only have 4" flanges. im keeping 2 cool with 1 4" 170 cfm fan.