Air has by far the best warranty out there. Sotar's is not a no-fault and is not 10 years(but you wont need it
). I dont know what Maravias is.
I would say that both Sotar and Maravia are easier to maintain than an aire...simple is best.
That being said, they are all great boats. In Idaho/Montana there is little to no silt and I havent heard of anyone having issues with the Aires for that reason. I think that you should be fine with any that you choose, just find a deal, color, size or whatever you are looking for and get on the water.
If you need somone to lead you down the gorge this summer let me know.