I can reply on the blue Ice Armor and on the Arctic Armor (tried them on/have one) and the grey extreme (buddy has one).
The blue Ice Armor is basically just a waterproof/wind proof shell type suit. No insulation thus it will be the lightest in weight but all "coldest" requiring more layers. I tried these on when I was shopping as it was really the only other option at the time.
I have a Artic Armor suit and it is very nice. Not sure of the total weight but I would agree that it in the 6 pound range. it is also water/wind proof and insulated (plus floats which is nice too). I am a bucket sitter so regardless of the weather I am out in it and this suit has never let me down. A couple of thin layers under it and I usually have to leave the coat 1/2 unzipped on all but the coldest/windiest days. If you go with a Arctic Armor suit make sure you try it on with your layers so you get the right size, too small and you may have cold spots. Their sizing, atleast used to run kind of screwy. got my suit 3 years ago and I am 6'00 220 and wear a med coat and large bibs, would have thought I was XL in both, LOL
I know someone that has the Grey Extreme Ice Armor suit and it (the coat atleast) felt much heavier than my Artic Armor one when I handed his coat to him once. Plus he always seems to have to layer up alot more then me, but that is subjective as everyone reacts to the cold differently.
Hope this helps
J-