Hello. I've owned a Sony 505 for over a year, and I bought a DX last week. And I live in Toronto.
I bought the DX from eBay for $534 US.
From first hand experience, the DX is much better than the 505 for displaying PDFs, although I've only tested with a few PDFs, including a book and a technical document.
3G is very strong in the Toronto area... (of not benefit to the DX of course)
And I've been buying books via a US VPN without issue.
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