None of the above is a significant improvement over your Fuji.
You want less heft, but also a 'tank like' build and more power. That can't be done with a binocular afaik.
The logical solution for you is a draw scope such as the Swaro CTC 75 (see:
CTC 30x75 question? )
or something similar with 18-45 zoom from Zeiss (only twice your budget). There are lower price options from Optolyth and Meopta, with Meopta probably better quality, except they apparently have just decided to get out of sports optics.
Your fallback is the Canon 15x or 18x50 IS, the image stabilization allows for tripod like seeing without the hassle of a tripod. Again priced above your budget, but they really work very well. I have the 10x42, most capable birding glass that I know of, the IS transforms the viewing.