humor missed alert...
"descent" = any passing from higher to lower in degree or state; decline
"decent" = adequate; fair; passable
i think i would first determine what skis you wish to rent. and are you just looking for cheap rentals or nice demos?
usually when i'm hitting a mountain and am going to demo (I never rent) I find out the shops in the area, then check them out online or call them to see what skis they actually carry. i also usually have a list of what i wish/would like to demo and several alternates.
if you are demoing, i'd find a shop that's on-mountain so you can partake in a multi-pair demo (if they offer it). this is great as you can try a number of skis for one "low" price as opposed to renting/demoing from a shop and only getting 1 pair for the day.
also, i think some shops might offer discounts if you're going to rent/demo for extended days (i.e. have them out for a week as opposed to a day).