Who'll make the biggest impact?

Considering Jimmy Clausen is already in South Bend preparing for spring practice, you have to give him the early lead on this one. But I'm curious who you all think will make the biggest impact as a freshman next year. Usually, quarterbacks and offensive lineman take a year or two to work their way into the lineup, while running backs and wide receivershave a better shot of playing right away, provided they can learn the playbook in time.

That said, let's start the discussion with some of the top local players at those positions:

Running back:

Marc Tyler (USC)
Pros: Freshman always have a chance to play at USC and Tyler showed this year that he's got the talent to be a star at the next level. His stock skyrocketed when he dropped 15 pounds in the offseason and improved his speed.
Cons: The Trojans already have a deep backfield and Tyler's coming in with two other highly-touted RBs. Plus, he's coming back from a serious leg injury.

Wide receivers:

Sean Wiser (Stanford)
Pros: If you can hang onto Jimmy Clausen's passes, everyone else should be a piece of cake. Wiser is fast, strong and sure-handed. He received a ton of accolades in high school but ask anyone at Oaks Christian who the most underrated player among their 10 Division 1-bound players was and they'll mention Wiser before you finish the question. Stanford averaged just 10.6 points a game and no receiver caught more than three touchdowns. So to say the Cardinal needs some help offensively is an understatement.

Cons: Stanford is expected to run a complicated pro-style offense that could take a while to learn.