If you are considering the Richer Sounds Onkyo 505 deal then I would seriously recommend considering partnering it with a decent set of 5.1 Speakers. The Q Acoustics 1010 5.1 System won lots of awards at £500 about 18 months ago. most retailers are still rating it at this price or a slight discount to £450. Superfi have the set for £299 delivered, bargain.
If you listen to a lot of music and have the space I would seriously recommend the £30 upgrade to floorstanding front speakers left and right. Either way though this is a really good set of speakers for the cash. Many reputable retailers such as AVSales and Creative Audio have been pushing packages of these speakers and the lower Onkyo amps for a while as they are a great match, especially now they can be matched for £500.