You might be surprised how many uses you can find for a rear blade in addition to moving snow---depending on your local living environment and what you do otherwise on your place and with the machine.
If you do go with a rear blade, get a quality model that is well constructed, not lightweight.
The thing we use is a 72-inch Servis (sp?) by Alamo probably from the '80's that along with the characteristics noted next also has a replaceable cutting edge. All things to consider.
I haven't been in the market for a rear blade in a number of years and haven't paid that much attention to what's available, but...
Ours has three features that make it more useful than 'straight' rear blades:
There is a swivel plate right between the 3-point lift pins that by pulling a vertical pin allows the entire blade boom assembly and blade to swivel something like 60-degrees toward each rear tire.
Then to top that, another swivel plate where the blade itself attaches to the boom allows the blade by itself to completely rotate about a vertical 2-inch center pin.
And further, the blade swivels vertically such that each side of the blade can be raised or lowered.
The angle of attack ('soil engagement') of the blade can be adjusted by changing the top-link setting of the 3-point.
And using the tractor's right-rear lift-arm screw-link adjustment, one side of the blade can be dropped even lower.
Think of it as a poor-man's 6-way that just requires manual setting.
The end result is that the cutting edge of the blade can be oriented just about anywhere you want it to one side or backwards.
Examples: cleaning a ditch can be done by angling the blade way over to one side and canting the blade down to match the ditch angle and angled in such way to throw spoil up onto the road, just like a maintainer. Once set, a slow drive along the road surface and you can clean ditches by the mile before lunch.
Backfilling a trench is dirt-simple by setting the blade angle so the tractor stays out of the spoil line and you just drive along, funneling the material back into the ditch. Faster than back-n-forthing with a hydrostat loader and a nice clean job. And in good soil you can set an angle that you can cut a pretty good shallow trench even though it may take a pass or three.
If you don't have a backhoe you can with this blade described angle one corner down and at such angle you can flip pretty good size rocks out of soft soil. No rear blade is going to engage hardpan without additional weight or ripping first.
Can't help much with an example involving snow. Rarely do we get enough to worry about and if we do we just stay put or engage 4-wheel warp drive to move around.
The only other insight is that every month or so walk your equipment line stored out by the fence with a squirt can of cheap used oil. Squirt everything that moves or swivels or rotates and pins and sleeves and bushings. I once didn't do this and when picked up the blade found it wouldn't angle like I wanted it to. Had to hang a big cresent on the end of the blade and use a cheater to start things moving. Oiling helps.
Please post back with your experiences and decision(s) so we can all learn.