I'll go the other way on this one - with RG3 potentially running a lot and the crowded backfield I'm not super high on Helu. I can certainly plot out his path to value easily enough - the 'Shanny Factor' could have me as their starting RB by week 7 so watch for me on the waiver wire, too. Having said that - weapons in New Orleans offense appeal to me. He comes highly touted, highly drafted and has 3-down ability with his burst, style and pass catching ability. If it was single season I MIGHT lean Helu, but for keeper value - give me Ingram.
And, if I could - I'd trade both or either of them for a good quality WR and then once I see what shakes out with starter/committee use that good quality WR to get a starting RB without the mystery
Fact is - BOTH are committee backs - which should tell you they'll be usable, but not great. And for 2012 there's almost nothing that will change their committee roles short of multiple injuries.