UHMW polyethylene is far cheaper than Teflon. You'll pay big bucks for Teflon or PTFE. UHMW poly will do fine. The snow plow companies use it for their lighter equipment.
I've got a front mount blade on my tractor and as long as you keep the skid shoes properly adjusted, you'll keep the wear to a minimum on the edge. Plastic will certainly wear faster than steel. Since you have a concrete drive, you probably don't have much of a crown on the grade. That should help to keep the wear even as well.
BTW, if you get the snow to pack to those washboard icy bumps, put the steel edge against the pavement. It will pop off that icy stuff in a jiffy.