<font color="blue">
Save some pennies for a hydraulic top link. Makes the box blade worth 10x its weight in gold. </font>
That statement is SO true that I dare you to try a tractor with a hydraulic top link and then go back to doing it the old fashioned way. In fact, I double-dog dare you!
I'd say a 72 to 84 inch blade, depending on your soil. I'd also second what the other folks said so far about buying heavy and getting what you pay for. I've owned Befco equipment, it is top of the line stuff. I like Midwest box blades and have one currently, they have a trapazoid shaped side panel that I like better than the rectangular side panes with cut corners. Especially when using the hydraulic top link to adjust the angle of cut. Take a look at the brands in your area. See if you can find the following features: Scarifiers that can be adjusted without tools. Lower link pins that are held in place on both ends, sometimes referred to as captured pins. 2 rear cutting blades, one for pulling the other when pushed in reverse. Heavy "A" frame assembly with at least 4 points of contact with the box assembly. Trapezoidal shaped side panels (my preference anyway). Heavy weight.
