Whomever can get the best drugs 
no doubt...but out of this list I'd have to say Aceto.
I've never heard anything that tarnished his name. His books, on dieting especially, are very good reads.
I used to like Farrah when he 1st came out with his 1st story version...getting robbed then shot while en route to purchase used cars at an auction. His "comeback" story motivated me...until I realized what a schmoe he is.