You can drag and drop to a Kindle as easily as any other e-reader; your computer will recognize it as a mass storage device.
But the short answer to your question is that you probably don't want an e-reader. They excel at allowing you to read, basically, paperback novels in their preferred format. The further you move away from this model, the less satisfactory the experience is. And it's fairly unsatisfactory on a 6" screen, particularly if the PDF has tables or graphics. It's not a tablet.
If you were interested in e-books and wanted the ability to occasionally read a PDF, then you might try a sony, as they seem to be somewhat better at PDFs than Kindles. But if you want something specifically for PDFs, you should get a tablet.
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