I thought the Rams were without a 4th and a 6th for 2015? If so, this isn't a simple case of just trading up. The picks we have left are more valuable than whatever the chart indicates.
Not sure where the 2015 class ranks but I don't see anyone that really compares to your list. If there was a 2015 version of Matt Ryan available, sure, go get 'em. But who are you saying compares? I don't see Luck, Newton, Bradford or even Flacco level prospects for 2015. I know you compare Winston to Roethlisberger so if one said that the Rams could get their own version of Roethlisberger in Winston, that'd be a no-brainer. Even worth a hefty cost perhaps. But I don't see it in him so it would be way more than I'd be willing to spend.
I mean, realistically if Winston even decides to declare, the Rams would have to move up to the #1 spot wouldn't they? The Jets, Titans, Buccaneers and possibly Redskins are all going to be ahead of the Rams and looking. If not the Raiders themselves(not that I'd give up on Carr but who knows with the Raiders?).
So, with what the Rams have to offer, what do you spend to get your guy?