B7500 5 or 6 foot rear blade .

[easygo]

I used a 6' blade on my former B7510 for snow removal and it worked very well for me. When the snow was deeper 10+ I pushed some cross-paths with the loader first and then went at it with the blade. It worked real slick. When the blade is angled and it is heavy, wet snow it will push you to the side some but it's not like you are going to have to get your tractor out of the ditch. I found a used medium duty King Kutter that is plenty heavy with reversible cutting edge. This thing is a tank compared to the Woods light duty blades.

I graded my driveway with it and the 7510 pulled the nearly full blade fine in 4WD. I had to move a fair amount of gravel to improve on drainage in the front of my house and garage.

To me the 6' size seems like a better all around option especially for light work.
Whatever size you buy get the tilt blade if you can afford it and you will not be disappointed.

 

[funwithahoe]

Had a 7 foot blade for an L3750 and wished I had a smaller blade - The longer the blade gets out past the base the more torque it has on those welds. If I wasn't careful I could have destoyed that blade in about 10 seconds (went through one base then was really careful).

Keep in mind the scrapers don't "trip" like the front blades do so when you do hit something there is going to be a "give" somewhere. In an ideal situation your tractor is going to spin but if your tractor is too big (or your blade too long) the blade will give - meaning something is bending or breaking! Easy to do when everything is frozen up!

Bigger isn't always better. That is my 2 cents anyways.