For your dollar, you can't beat the whey protein isolate that is sold by Muscle Feast. It would compare very favorably to Unjury or Jay Robb, except it is all natural and does not contain any thickening agents, which tend to leave you feeling extremely bloated. You can find their products at MuscleFeast.com.
You have to be very careful with your protein sources following this surgery as you need to make sure every bit counts. Stay away from proteins that contain whey concentrate, cellulose, and guar gum as these all tend to lower the amount of protein you get per serving. Also, if you can get an unflavored pure whey isolate, that would be the best choice as far as the most protein per amount you consume. The downside on an unflavored protein is that it does not taste as good as a flavored protein and this can be an issue for some people.
Also, in addition to staying away from whey concentrate, you should stay away from soy protein, especially for males as it tends to raise estrogen levels. And do not get any products that contain maltodextrin, sodium cassenaite, or calcium cassenaite. The latter two are really poor forms of protein and not digested well.