Hi Thurgood,
I'm glad that my discussion about the Daytona and Royal Oak Chronograph was helpful to you. As for asking for advice before making decisions about watches, I don't think its a bad thing, especially if you are new to the hobby, or if its a large purchase. I've been interested in watches since I was about 10 years old and I bought my first good watch (a Rolex) at the age of 14 in the mid 80s after convincing my parents to let me cash some bonds. I have found that over time my tastes change and before I consider buying (or on rare occasion selling) a watch, I will often consult with some of my other watch collecting friends. I also find that some of them will bounce purchase ideas off of me before they take the plunge. I think that its fine to take the advice of others, as long as you use the advice for guidance, but make the ulitmate decision about buying/selling on your own. I (or anyone else here) can give you advice but you know yourself better than we do. You know your own sense of style, whether you dress up frequently, or whether you are more casual, and things of that nature that can help determine which watches will best fit your needs.
As for Rolex, I am very familiar with them. I still own several of them. I actually, just sold a Rolex Explorer that I purchased in 2002. In 10 years I only wore it a few times and it had been sitting in a safe deposit box for years. Its a good classic watch, but it was time for it to find a new home and get some wrist time. With respect to your Datejust II / Day-Date II dilemma, Rolex does not make the Day-Date in all steel. The Day-Date is only available in 18Kt yellow gold, white gold, rose gold, or platinum. So if you have seen it in a white metal its either 18Kt white gold or platinum. A Datejust II is available in all steel, steel and gold (yellow or rose), or all gold. If you are no longer interested in your Datejust, maybe it is time to consider finding it a new home. Give some thought to how often you wear it, and if you don't wear it how long its been sitting around. If the idea of selling it has only recently come up, and you aren't certain if you want to go that route, take some time before deciding to sell it.
Regarding single metals vs. steel and gold watches, I prefer watches to be all one metal. Steel and gold watches were extremely popular in the 1970s and 1980s. Today I find steel and gold watches a bit dated and sort of 1980s on a man. I think on a woman steel and gold might make more sense as sometimes they were rings, bracelets etc. of different metals and so it may work better for them. Many companies including AP, VC, Patek, and GP have largely stopped offering steel and gold watches. A few good companies that still do a rather solid business in steel and gold and continue to offer steel and gold watches are Rolex, Cartier, and maybe Omega. If you find you are no longer interested in your Datejust II and that the two tone color combination is no longer your taste, then perhaps it is a piece that needs to find a new home, but that is a decision only you can make.
Best regards,
Dino