Shaun,
I have purchased a Denon DVM-4800 (11/03) and a AVR-1905 (3/05) from ecost. I have 3 friends who have also purchased Denon refurb gear from them over the last year. All positive experiences and at substantial discounts.
They are an authorized Denon dealer. Just a few things to think about. Shipping is a tad expensive. The gear has a 90 day warranty. For not much money, you can also purchase an extended warranty.
As an aside, compare the 1905 to the 2105. The difference in features doesn't really justify the higher price of the 2105.
Good luck with it.
