Most economical choice is usually the one closest to you to save on shipping. Maybe even find a fab shop close by that will custom fab one for you if you let them have your Xterra for a few tests. Others on the more economical side are
-ARB (can be found on sell a few times a year)
-Hardcore Offroad
-Calmini
-Dezert Runner Offroad
-Black Widow Gear is the lowest cost winch bumper i have found (quality could be spotty). the dollar is strong compared to canada. Exchange rate is heavily in your favor.
-Tube bumpers tend to be less expensive.
little more expensive. (possibly worth it)
-Shrock
-Hefty Fabworx
-Blue Lake offload
-Iron Bull
-Coastal Offroad
-Expedition One
-Maxterra/Max Gear (rear only) Several options low and high cost. Great fitment/quality. Contacted through email or PM on here (Maxterra).
i'm sure I am missing few. There should be plenty of threads on it.