I guess it depends on the type of soil, but you can never go wrong with compost, leaf mould or rotted cow manure. Worst in my experinece in clay soil is peat moss.

They are all fairly expensive sources of organic matter, rice hulls, bark, etc. If you have access to other sources of organic matter, preferably for free, that would be your best choice, otherwise it depends on what you are going to do and how much you are willing to spend.

I don't know the Kellog products but in this area we mulch our roses with sphagnum peat moss to increase the soil acidity. It sounds like you have very good soil so the addition of organic material such as compost would be sufficient. You only need about 1" application of compost every couple of years. Our best rose grower fetilizes with 16-20-0 lawn fertilizer. It's usually on sale and it appears to have some sulfur in it.

I guess if I had to pick one from your list I'd go with N'Rich. It looks about the best all-around product they offer.

But it sure is expensive, way too costly for me even if I could get it around here. And as the others have said, there are much less expensive ways to accomplish the same thing. ;) But if you can't make compost yourself, have a small garden area, and if cost is no object then none of their products will hurt and likely will help.

Dave