For dip and chew, the most common varieties are Dark Air and One Sucker. Order a lb. of dark air from Don and play with it. Both Dark Air and One Sucker are very high in nicotine. Workhorse can tell you alot about the One Sucker. He makes a Copenhagen copy with it. I use Dark Air in small proportions in my cigarette blends, tamed down with Maryland. I don't dip or chew. If you don't want to invest so much in something you may not be happy with, I can send you a sample of Dark Air, however, since dip and chew usually involves casing and experimentation, a small sample may not get you very far, that's why I recommended buying a full pound. There are some good recipes in smokeless tobacco sub forum that could help get you started. If you decide to try a sample anyway, shoot me with a PM.
There are several varieties with Havana in the name. Can you narrow it down some? They all have subtle differences. Most of them are cigar varieties.
The best advice I can give you in the long run is to read every single post in every single thread on the entire forum. You will not only answer the majority of your own questions, but can even begin answering the questions of others. I've read every post on the forum and read every new post that comes in. You'll also find more answers to your questions as some of the old hands get tired answering questions that are asked by every newbie that joins up. This is not a condemnation, I did the same thing when I joined. It was when I began searching for answers first that I really began learning things. Then ask informed questions and you'll get alot more responses. Again, not knocking you, just trying to be helpful. Aside from the new flue cure experiments, there is very little that has not been covered already.
Best of luck. If you can't find what you need, ask away.
. Yea down here in South Florida, we don't get frosts till early in the new year.