In reply to graeme jackson:
Partly true, but if you're buying with a view to upgrade, then it's nice to know that your speakers are slightly future-proofed. If not, then, in terms of your overall budget, roughly 20% CD Player, 40% Amplifier and 40% Speakers. Spend an additional 5-10% of what you spent on the system on the cables and interconnects.
To the OP, you didn't mention if you already owned any speakers, because that Denon system doesn't come with any.