I run an SSQA 84" HLA 2000 blade on the front, and a Land Pride on the rear. Both are nice blades, and work well for me.
Heavier blades tend to get ice and hard pack up better with the potential of more pavement scraping. My HLA blade weighs about 500 lbs and I usually don't float the fel because the weight on the pavement would be excessive. I generally set the blade down until the weight of the blade only is on the ground, then feather the fel as necessary.