Hi and welcome to the forum!
its very nice to see that you have taken good care of you car throughout your ownership. But as you know, unless you are incredibly attentive everytime you wash or touch the car, scratches will build up during its life time. I can tell you understand what swirls and the such are, and to restore the gloss back to the paint you must level back out the finish.
A cleaner wax is a very very mild abrasive mixed in a protective sealant of some kind. Most swirls and scratches cannot be removed by just cleaner wax alone.
To to answer your questions:
Stepping up to Ultimate Compound and Polish is the right route, but understand, achieving a flawless finish with abrasives on clear coat paint is quite a skill. If you want a perfect or even just greatly improved finish I would buy a DA Polisher.
The reason I don't recommend the one step polish and wax is that in reality it is nothing more than a more aggressive cleaner wax. Working by hand would also very much hinder its effectiveness.
For protection (sticking in the meguiars line) your best bet it the Ulitimate Wax. It does require a very clean and thin application. And an attentive removal, but it's durability and protection are incredible. It doesn't have nearly as many fillers as Gold Class wax this is why your finish might not be as deep, but Gold Class can not compare to UW's protection.
Hope I answered some of your questions! I'm just sitting in study hall and saw your post.
Have fun, and once again welcome to the forum!
Griffith Hawk

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