I've picked Lynch the last two years in the second round and he's been the reason I've won both years.
Here's the thing, throw out the "you shouldn't draft a QB/WR/TE in the first round" mentality. Who do you think can give you 20 points a game? Choose them. I either had the 3rd or 4th pick last season and I chose Megatron. He set an NFL record for receiving yards. The first pick in my league was Brees. He threw for 5,000 yards again and had a league best 46 TD's. I managed to get P. Manning in the 3rd and that worked out great but he wasn't even on the page of "best available" when I chose him so I think he was out of sight out of mind for a lot of people, but that's not going to happen that often.
In no particular order you should consider Aaron Rodgers, Drew Brees, Megatron, and the guys you listed. If I've convinced you that not drafting a RB until later is something to consider, keep in mind that Steven Jackson, Montee Ball, Matt Forte, and DeMarco Murray will be available in the middle rounds and should get 70% if not 100%+ of the same points as guys you're considering. Alfred Morris should be available in round 2 and I think he'll have a better season than Martin, but choosing him in the top round would be dumb in my opinion. Shouldn't go ahead of Jimmy Graham.