Hi TBG
With all these things the best thing to do is listen for yourself. You will be surprised how 'wide' the sound appears.
This is near the bottom end of the offering from this company and they are renowned for the quality of their systems. Basically, all they know in a single box.
I have the smaller version of this (the Muso Qb) for the kitchen and everyone who hears it comments on the scale and quality of the sound from such a relative small box. It is in a different league soundwise to the Sonos offerings, but should be for the price.
The way I'd describe it is that you'd use the Sonos type systems for TV speakers and background music, while you can sit down and happily listen to the Muso as a proper stereo too.
Alternatively, if you are looking for a traditional stereo then I'd support an earlier suggestion to find your nearest proper HiFi retailer and ask them show you what is possible for £1000. They will be best used to producing the best systems to a price point and you'll start off with a much better chance of getting what you want.
Most good HiFi retailers will usually let you try the system at home as well to make sure it suits your room before you finally purchase. Audio T in Cardiff is no more expensive than John Lewis either for the Muso. You can also hear the higher cost systems so you know what your money is buying you.
£1000 is a fair bit of money - enjoy listening to a few systems before buying!