Re: orbital buffers!
I hope you are well.
If you looking to remove swirls then you could go with a Porter Cable (PC) which you might pick up cheaper than the Megs G220, although once you have bought pads and polishes it will be a good £180+.
Some Rotary polishers work out a lot less but be very careful as if you have never used one before you could easily cause big problems to your GTVs paintwork. Although some rotary polishers appear very cheap you have to make sure that they have a decent RPM range, as you need to be able to work the polishes at a reasonably low speed to refine the finish after you have carried out defect removal.
As Mr_Caine said, I think this is the orange peel effect that you are talking about. I would strongly advise against trying to rectify this yourself if you have never wet sanded and machine polished as you could very easily end up with some knackered paintwork. Even as a pro it is not always possible to remove the orange peel effect as so much depends on paint depth, condition, type and also whether the orange peel is infact in the clear coat or colour.
If you remind me where you are then I can let you know of someone who could correct the paint for you. I'm not saying that you need a detailer every time but I think on this occassion it would probably be a good idea.
If you do fancy doing it yourself then I suggest getting a few scrap panels and refining your technique first as you can then leave all your bad attempts on some scrappy panel rather than a stunning GTV!