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Buffing your paint is an art. OP if you do not know what machine to buy you dont know what products to use I would sugest you pay a pro to do it. I have 35 years under my belt. As for waxing I recomend only by hand P21 concours look is hard to beat and very easy to remove if you do a small section at a time and remove it while wet. There are so many products on the market for buffing you dont want to ruin your paint. Let a pro buff your car and wax it and you can follow up with waxing after his wax wears off. If you have any ?'s feel free to ask to find the rite pro in your area.
I would go with the Porter Cable or the Griots if you are a beginner.
They wont get out very deep scratches or sanding marks, but they are a good start to get you in the swing of polishing.
I purchased the Mikita and it has served me well. This model has both a orbital and rotary setting. I find that I never use the orbital as it just does not "cut" it.
One feature that I was told to look for is a progressive start-up. This slowly starts the buffer when the trigger is pulled. Saves on compound, damage to finish, and helps eliminate blowing circuit breakers when you have multiple items running on the same circuit.
Also, as recommended above, invest in quality pads. I purchased an assortment from Griots. I later picked up some from Harbor Freight and while cheap, they are of poor quality and introduce swirl marks easily.