working in the paint and body business, i deal with this question a lot. First, if you say new as in 09 you don't need to use a clay bar on it for a while as long as you keep it clean. If you start using clay on it while its brand new out the box, it will wear your factory finish down faster.
Second, a orbital buffer would be awesome. But if you are going to get one, don't get the rinky dink kind you find at advance auto or walmart. You'll need to invest upwards of 200 to 300 bucks to get a good set up. I use a dewalt 7 inch buffer/polisher/ sander, yes sander, that can run from 1k to 3k rpms, it's freggin awesome.
The mcguire's scratch x aint worth ****. The 2.0 PASTE WAX I think is the best on the market for the money. If you can get your hands on it, find a local automotive paint supplier and get the 3m polishing set up. It is a extra cut rubbing compound, a dark polish, and a swirl mark remover. Use these three and a good coat of wax, it'll look like your car just rolled off the showroom floor.
And when it comes to scratches under the door handles, you will want to use RUBBING COMPOUND to get the best cut and then polish it off with the 2.0 wax. Just do it by hand, it'll look fine.
If you are close to an Advance autoparts, they sell a badass microfiber wash mitt that I highly recommend. You are really just wasting your time and water with the two bucket method. I think, as long as you keep your mitt clean you should be fine. And rinse your bucket everytime before and after you use it.
DO NOT USE THE WASH MITT ON YOUR WHEELS THAT YOU USE ON YOUR CAR. I've seen some people mess their shizz up big time doin that. and make sure you rinse the mitt thoroughly any time you drop it or even think it may be dirty. Same thing goes for your shammy. And I DON'T RECOMMEND THE CALIFORNIA WATERBLADE especially on a black vehicle. Just so ya know