I think the OL problem last year was one of coaching, not talent, so I'm not convinced that help is needed there. I think they are pretty deep and pretty talented.
On defense we are counting on a lot of people to make big steps or big first time impacts, especially on the line.
I tend to agree with you Re: coaching. Constant screaming and profanity works for only a short period of time. If we can get the pulling guards to hit the right hole then I will be far happier. There was one (short drive) last year where the right guard pulled too far inside, totally negating the main purpose of pulling the guard. There were way too many individual breakdowns on the OL last year. If they can play consistently as a unit we will be miles ahead, if Graham can keep the RBs from dancing.
As an aside, I am still not convinced that Bullard is the answer at center. If Stone loses out at RG I think he is a far better answer at center, snapping left handed. I consider Bullar the 6the best lineman, at best, probably closer to the 7th best in my view. He got beat time, after time, after time last year.
As to your original qustion, I think I would go with H&H green stamps, as in Henderson for the DL and Henry at RB. Honorable mention to the most likely greatest leader of the VOLS in my adult life in Al Wilson, who, IMO, single handidly (with an assist from Grant) beat the crocs in '98.