For what it's worth, the ORX was designed primarily as a gold nugget detector. Probably a real good idea to check around on the forums to see if other people are happy with the features or lack thereof. You might even ask some people. Stuff like iron volume adjustment may not seem like much but in a trashy area might make the difference in being able to work the area or not. The Deus can work those areas better than most, that means you'll make finds where others can't work. 99% of my finds are in areas others have already worked.
My opinion spend the money on what you really want. Pay Pal credit usually offers six months free interest, and if like me you can get a credit card offer to transfer that balance for another year or more and pay it off slowly with no interest. There are some good sales going on now, coils, MI-6 pinpointer (get one for sure).