I think is a 497 the amp you have rather than the 479.
If it came with speakers then it was probably as a promotional bundle. In that case there's every chance that the speakers are quite basic. There'll be a model number on the back of the speakers if you want to look them up. I'd agree with pre1twa though; the speakers won't cause a problem with either new amp but they won't do them justice either.
The 807 is really a very good amp. I've sold a few of its smaller sister, the 707, with Focal Chorus 714v floor standers as a front pair for music. These stereo speakers are £600 on their own. An 807 would be more than capable of driving them to a quality that would surprise many Hi-Fi enthusiasts. A full Chorus package would be close to £2000, and an 806 would do that justice.
The 608 is, IMO, more AV focused. I would partner it with Monitor Audio Vector (5.1 @ £600), Bronze (5.1 - £1000) or Radius HD (5.1 - £1200) for a balanced system.
The lowest I'd personally go with either amp would be the Q Acoustics 1010i 5.1 kit that Richers knock out at £300. IMO, it's still a low-ball solution, but not embarrassingly so. Anything less than that though and I'd consider a lower spec amp.
Second-hand is a good way to get great performance on a tight budget. Unlike AV amps the rate of development is much slower in the speaker world, so you don't need to chase the latest kit for great performance.
Focal and Monitor Audio get my vote again. I'd love to recommend Kef Q Series because I think they look beautiful, but I find they sound a bit dull; and I really don't like their Eggs which I find lifeless even when driven by much bigger amps than the 807. Same goes for Tannoy's version of the Kef Eggs. B&W and Maudant-Short might be worth a look. Missions are 10 a penny, but you really need to know your good from bad as there are so many versions of the same model. I also think they're a bit below par for this level of gear.
If you fancy something a bit unusual, I have a Vibe Audio Monolith Classic 5.1 kit that I'm just about to move out of my dem stock. It's about 6 months old.
