Thanks for the help on mine.
I really, really hate Forte. In fact, I just dropped him in my (non-PPR) league. In PPR leagues, though, he definitely holds value. IMO he'll go for something like 40 yards on the ground, 3 catches for 25 yards, and maybe a score. If catches are one point, that leaves him somewhere between 9.5 and 15.5 points...a solid day.
Wells is definitely the Cards' favorite back right now and has a dream matchup against he putrid Rams defense. His yardage totals won't be huge and doesn't do too much catching balls out of the backfield, but he does have a great chance of scoring. I see him getting something like 65 total yards, 1 catch, and a score: 13.5 points.
Morris will do business in both the running and passing games. I think 100 total yards and 6 catches is certainly reasonable, which gives him 16 points. If he throws in a touchdown or two, he'll have a monster game.
Accordingly, I'd go with Morris since his fantasy production will hinge less on getting into the end zone than the other guys. Good luck!