Okay, I looked the trimmers over this evening. Here's the rundown...
Poulan PRO PP2822, 22". Pretty good shape overall, but several of the teeth are broken off. It still cuts fine as I trimmed a dozen bushes with it this spring. One nice thing about it is that the handle pivots 90-degrees left or right to make off-hand or odd angle cutting easier.
Echo HC-1500, 16". Pretty decent shape. I put fresh fuel in it and it started & ran like a champ. The only issue I found is that the gasket in the fuel cap is bad and it leaks fuel when turned on the side. Again, it runs good, but it's been sitting for a long time, so the carb should be cleaned as a good TLC/PM effort.
As to avoid unnecessary time & effort on my part let me know which you're most interested in and I'll PM you photos and pricing. For the record, I would much prefer to sell the Poulan and would be willing to give a better deal on it if price is a large deciding factor for you.