In my opinion as a rusty diver not familiar with the current brands and models
1) I think you are on the right track for wrist mount. Personal opinion but I was so much happier since I switched to that arrangement.
2) since you are on a budget I'd buy the cheapest one that has a huge number of good reviews...basically something that has been around a while and has proven itself not to be a problem child.... such as common seal failures/flooding or something like that. None of the added bells and whistles are going to likely matter much....just nice to have not need to have stuff.
3) and I'd put a minor bit of weight on which has a button menu interface that makes sense for you...but that's low on the list because you can figure any of them out in short order.....
They're ALL going to tell you what you need to know.... depth, time, ascent rate, and deco status. This is based on the assumption that you're just doing recreational diving. No need to spend extra money unless you can
...and is especially true if you're primarily or only diving relatively shallow/easy dives on charter boat operations in tourist oriented places such as FL.