I have to presume from what has been said you tractor is 30 hp or so..
We got a China built, 5' box blade from our local auto farm store on a catalog sale flyer reduced price.. We use it on a 32 hp JD.. The blade is 2" a side wider than the tractor foot print that has loaded turfs..
When doing aggressive work, the tractor has plenty of power, just not weight to maintain traction.. The China made blade does all that is expected of it, and what a box blade is capable of doing.. The fact it came at a much lower price than other options in this area is a bonus to me..