I like Mayfield more than Darnold and Rosen.
I'm also a big Nelson fan, I would love to see the 49ers get him at 9/10, I also think Billy Price is underrated, I think he will be an all-pro C.
I think Barkley is a little overrated, while he's 230lbs and has great physical traits he doesn't play big and his production isn't elite, he's a big scatback who can bust open a big play if given space but he doesn't break tackles or gain much yards after contact from what I've seen. I much prefer guys like Derrius Guice or Sony Michel.
I really like WR Jake Wieneke from South Dakota State, I think he will slide into the 2nd round.
My top 10 prospects at this stage (no particular order):
QB Baker Mayfield, 6’1 220, Oklahoma
QB Josh Rosen, 6’3 220, UCLA
QB Sam Darnold, 6’4 220, USC
OL Quenton Nelson, 6’5 325, Notre Dame
EDGE Bradley Chubb, 6’3 275, North Carolina State
LB Roquan Smith, 6’0 225, Georgia
SAF/CB Minkah Fitzpatrick, 6’0 200, Alabama
OL Billy Price, 6’4 315, Ohio State
CB Denzel Ward, 5'10 190, Ohio State
WR Courtland Sutton, 6'3 220, SMU