Hyside, NRS, Aire - I don't think you can go wrong with any of those from what I can tell. I just bought my own boat myself, and I spent the last several months doing all the research I could to try to answer that question. I know an outfitter, and he LOVES Hysides. He also owns an NRS Cataraft. He's a big proponent of Hypalon boats, so that's the direction he steered me.
A co-worker of mine does a LOT of rafting, and he owns an Aire. He swears by it, especially for the warranty and the design. The bladder design is probably the best feature (says the outfitter I know too). It's PVC though, so probably won't last as long, may require more care, more suseptible to sun, etc.
When I talked to the people that actually sell them, I got pretty much the same repsonse on those three boats. One person I talked to claims Hyside quality has gone down the past couple of years, but other than that, it was almost a toss up between the three.
In the end, I went with an NRS Otter series because I liked the idea of a boat that could last me well into my retirement. LOL It happened to be on sale too, making it a bit less than an Aire actually.
Good luck with your decision, and I hope you get your boat soon! Any chance you'll be on the Salt next spring (I see you are in Arizona)? That was my Dad's first whitewater trip (before they dynamited Quartzite Falls). Talk about a newbie! LOL