Yes, you could use your curl / dump function to control a power angle plow. You can easily adapt a manual angle blade to a QA plate and just manually change the angle. Having power angle is not really important unless you don't want to get off the tractor to manually change the blade angle.
For your $200 about all you can do is adapt a manual blade to a QA plate.
I went with PA so I don't have to get out of the nice warm cab. My tractor has rear remotes so I ran a pair of hoses up to the front and use the remote to angle the blade. I have about $600-700 in my plow and that's just for the QA plate, extra steel bracing, hoses, hyd. fittings, relief valve, misc. welding materials and paint. I already had the used truck plow sitting in the yard.