I have been thinking about this a bit more, and would agree with AlexS' points although I'm not a fan of Parasound, but that's a personal foible.
I think Arcam, you would be better off not buying anything for the moment, and saving up the pennies (well, the pounds!) until you can afford an amplifier that will do the 804s justice.
In the meantime, the AVC10 can be used to power the 804s but won't be doing them full justice and they will still sound good. By waiting 6 months, you will be better off in the long run and when you do get a superior amp (such as the Bryston, Chord or Krell mentioned by Alex), you will enjoy it even more.
Keep your eye on ebay for amplifiers, there are a few Krell items on there now (A couple of KSA50s, a KAV300i and an FBP300c). I don't know how good these are, perhaps AlexS can enlighten us?
PS the FBP300c is being sold by someone called Berkshiresound who only accepts payment by wire transfer. There is a Showcase also for sale by someone called Norfolksound, who also accepts payment in the same way - looks a little dodgy to me.