RE: always looking to upgrade. (help)
Though I might catch some flack for this, the Durango' s design is basically along the same lines as the Mathews MQ1, MQ32, etc... Those were the first few bows that started to utilize more parallel limb designs and a larger idler in conjunction with a rounder perimeter weighted style single cam.
So, look at what is out there now to compare it to. The Legacy and LX both still offer roughly the same parallel limb design, though more exaggerated to increase the effect, and the basically the same style of oversized idler and round perimeter weighted style single cam. Have there been improvements? Yes, definitely. But are those improvements " significantly" better than what you are currently shooting? No, not necessarily. About the only thing that new bows have over yours is that they are a bit quieter right from the factory due to the limb/cam mounted string and riser dampeners.
If you are looking for an " upgrade" then I would try to find a bow that offered better quality components and/or a different (slightly or greatly) cam design that offered more speed, a smoother draw or some other benefit that will show a significant difference from what you are currently shooting.
As to the bows in question....though I was impressed with the intricate attention to detail on the AR bows I would probably go with the 34 model instead of the 31 simply because of the slightly more forgiving design while still giving you many of the benefits of a shorter axle to axle length bow.
The Nitro, though very well made, does not really give you anything that you do not already have in terms of design or specific benefits due to the bow' s shooting characteristics.
You did not specify which Bowtech model but assuming you were looking at some of the more popular ones...Pat DC, EXVFT, Pat SC, Pro 40, etc.... I would say that they will be of roughly the same riser/limb configuration but with a somewhat stiffer drawing cam that offers substantially more speed than what you are currently shooting.
Hope this helps some.
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