Floorstanding loudspeakers are not as good value as standmounts. They often have only a marginal increase in internal volume and an awful lot more wood and postage associated with them. If you want the very best value at the lower end of the market, look at out-of-favour AV receivers (you can get good ones for fifty quid on the 'bay) and good quality standmounts around the 200 quid mark (some of them are amazing - Wharfedale, Dali, Q). Pick your source from there.
EDIT - I had a Minx Xi and it's terrific, even with £1k+ speakers, but the choice of something like that will depend on how wedded you are to the idea of streaming over silver discs, obviously. I'd also suggest that Sonos gives a superior user experience and flexibility.