Ok -- I expect to get beat up over this, but here's what I think:
Firstly, for reasons we all find unfathomable, Sean McVay seems to trust in Sean Mannion. So I think the odds are the Rams just stand pat.
However, if I were calling the shots, I'd take a very serious look at Austin Davis, who's likely getting cut loose by Seattle after they sent a draft pick to GB for Brett Hundley. Unless the 'Hawks plan on keeping 3 QBs on the active roster, the Rams should be able to sign him without compensation. I would consider Davis a clear upgrade over Mannion: he's actually started and WON games in the NFL and at 29 years old could potentially back-up Goff for several years. He's got enough wiggle and improv ability to make plays off script, which I think is essential for a backup QB (unless one of the heir-apparent type). I think the Rams would remain very competative with Davis if Goff missed games. Finally, according to all I've read he's of good character and would never be a locker cancer or distraction.
I don't consider either Allen or Perez suitable backups this year, though they may be worth looking over again next summer.
