Welcome, Roy!
The wireless downloads from Amazon are great. I've downloaded some freebies from other sites using the USB cord, but the convenience of Whispernet can't be beat.
My husband has been wanting a Kindle since I got my K2 in February. I just ordered the DX for him as a Father's Day gift. He reads hard back books mostly, so I think he will prefer the DX.
To save a few bucks, I signed up for the Amazon Rewards Visa card at the same time. That gives you a $30 credit after your first purchase. And they give you higher rewards points in the early days of having the card. If I calculated correctly, this should result in a $25 Amazon Gift Card, just from the DX purchase.
Since I know that I would spend that much on books at Amazon in the near future, I count this as a $55 total savings on the price of the DX. (If you want to try this, just be sure to check the math for yourself - I don't want to mislead someone.)