New amp and floorstanders for £1500
Wow, thanks for all the links. Some serious thinking to do.
I listen to all kinds of music but do like early 90's house music, with lots of piano sections and female vocals!
Hi Dan, the 2050i is a pretty impressive speaker that'll deliver in spades. They'll work with modestly powered amps (they're 91db I think) but put them in with something that's going to deliver a good bit of power to control those drive units and the scale of these impressive speakers will surprise most folk I think. Huge sound, but not leaden-footed. Very impressive for the money and amp-wise you'd need to try a few out but think Onkyo 9070 (£900), Harman Kardon's HK990 (£700-£1300 depending on where you buy) and probably a few others I can't recall offhand.
They'll go a treat with house music and will handle piano nicely (the time I heard them they had a classical piano piece on in the shop). If you route your DVD player through your stereo, then they'll be huge for movie soundtracks as well.
Big fan of Q Acoustics speakers, if I have the room such as yours for a pair of larger floorstanders one day, then they'd be on the list no question. Good call. 
EDIT: As an alternative suggestion, try out, or at least shortlist for demo, some of the Onkyo AV amp range - there's good deals now on the 616 and 717, both of which will enable you to cost-effectively bi-amp, and deliver additional functionality (multiple digital inputs, which the amps I mentioned earlier also have) that'll let you hook up other devices via coax or optical inputs. They'll also offer you network connectivity which is a huge bonus and features like onboard Spotify which they've integrated into their recent range of gear.
Really, it is a bit like the Truman show round here.
Drop Allan Hendry an email at Monopulse. He sold me some ex-dem model S for a very good price. Ask about the model A too for your size room - don't be put off by the price on the website!!!
He guarantees the speakers and will follow up with several emails to see how you are getting on with them. Highly decent man to deal with.
At least take a look at the website and see if you like the look of them!
For that money, I'd also want to demo some Epos speakers - Epic 5, Elan 30/35. Would work very nice with a Creek Amp. Lintone were selling the 5350 half price recently....
(haha, just read your first post again to check details and see Cno's early reply for the Epics and Creek)
New Arcam Amp just got a blazing review too.

The answer to life, the universe and everything isn't 42. It's 9 or 40. For these are the model numbers used by AVI. Any hi-fi query and the answer's 9. Or 40. Doesn't matter what your room size is. Or your taste in music or hi-fi. The answer's always ADM9. Or 40. In the AVI universe anyway.