The HRE's are a relatively heavy wheel. And, trust me, some of the HRE drop center wheels (like those pictured) have had issues with retaining water, thus causing a terrible imbalance after washing and especially when it rained.
I will bet that you will gain weight over oem with those.
Like others have pointed out; Champion and Kinesis make some nice, light weight products. They are manufactured at the same plant and have similar weights. the nod does go to Kinesis for lowest weight, however.
The 20's obviously add weight and imo don't look right.
By the way, I think the oem wheels look absolutely incredible. I've had so many compliments.