Keep in mind you're going to need more than just the tool, but also buffing pads and polishes. Unless you've got a really good local detailing supply shop open on the weekend, you're likely to end up having to order that stuff and wait anyway.
The Porter-Cable has been berry berry good to me. Good availability of pads for the unit - see these prior threads (there are many more if you search) if you haven't already:
Porter-Cable 7424 Polisher
PC, Poor Boy's 1/2 & Zaino = Wow!