I would mainly use it to drag gravel back to the center of the driveway, slide sloppy April (May?) snow out of the barnyard to lessen mud season, and to push the snow farther out (like you said).
I have a box blade, but it's still easier for me to put the final crown on with an angled blade. The last pass is down the middle w/ no angle, so a 7-footer would work there. (offset and angle & off-level to drag stuff to the middle and build up a crown, then level & not angled for the final pass. I'd probably still use the box blade in the yard, the debris floats to the top and is easily disposed of
The Bison blade that Jyoutz linked does look nice, but I'm mainly looking at CraigsList and local used for $400-650 (just the range I'm seeing). It's hard to justify more when I'm still learning on the box blade. There is an 8-foot Bison, but it looks flimsier than the 7 footer (and Bison-guy hasn't responded). The bison tilts but must be unbolted to offset. The 7-footer is easy to offset, and does not tilt (the adjustable side link is sufficient for the driveway, but I couldn't dig ditches with this one). I'm leaning towards the heavier duty, offset-able 7 footer. Maybe just because I'm impatient?