The Fit diopters are of intermediate strength and easy to use...
... just to add more to the mix!
Fit +8D (equivalent to Subsee +5D) with step-up adaptor:
Pygmy seahorse, Lembeh Strait, 105mm + 1.5x T/C + Fit pro +8D
I like the combination of a teleconverter and the option of greater magnification with the wet diopter. I think it's a good idea to set up for supermacro and not to switch between 1:1 and supermacro on the same dive, although the macro lens and the +8D don't change the setup and mindset too much. I do believe in planning the shot and diving the plan, if possible. My planned shots are definitely better than my opportunistic efforts...
... I really wouldn't start with a +10D Subsee: it's too big a step, too different a technique and the learning curve is very steep.
I would think hard about using a really strong image on the home page, moving your biog to the inside and also putting the galleries inside except for, perhaps, a small (20-30 images) portfolio that sells your style to the browsing public.
I like Rob Bailey's gallery, but perhaps I shouldn't talk because I've never put my own images into order...
I want to achieve great photos straight from camera.
A great ambition, but one confined to transparencies in the days of film. Darkrooms have been part of photography for most of its existence, and are fundamental to photography as art. I learned how to shoot by working in a darkroom, by seeing what worked in the negative.
Morten is right in two ways: the better the image in the camera, the better it will be when projected, printed or seen on the screen; he's also right to say that learning to make those excellent images requires a lot of practice.
I would point out that some of that practice can be in front of your computer.