Looks like I will be the odd ball here, but for one, no way I keep Jacobs over the other options. I would MUCH rather have Steve Smith at the expense of a 2nd than Jacobs at the 3rd.
HOWEVER, I don't keep either and keep my draft picks. Do need to know what happens if you keep 2 players that cost the same round? I go for the VALUE, Turner, Gonzo Lt and Jackson are all damn good values and cost you basically nothing. So you have a top RB, two up and coming WR's and all of your picks that matter.
If you only opt to keep 2 of them, I would keep Vincent Jackson over Gonzo Lt, but it's VERY close. I would then keep Turner, Smith and Jackson.
As anti Jacobs I am in this decision I am even more anti Cutler, no way I would keep him in this format.