No installer worth their salt will recommend floorstanders in that room. Most installers recommend a sat/sub system for any small to mid sized room. The likes of MK Sound do some great sat/sub systems that wipe the floor the standard 5.1 packages people buy like the QA, MA, KEF etc
Some floorstanders can work fine in a room of that size, just pick the right floorstander and use bass management (which you would use anyway) If you don't mind speakers taking up the room lol.
Those Celestion A3 sound great in a room similar to the OP's (It'll be moving into a large living room soon same for the Kef Reference 2.2's) The Celestion A1 standmount sound great too, but they need a sub and tbh for 2 channel music I do prefer stereo speakers only, no sub, no bass management running L/R in full range if possible. In the HT the processor doesn't have a "pure mode" so with floorstanders and sub, both set to 70hz in bass management it sounds great, sub isn't playing too high, floorstanders aren't playing too low (for the small room)
M&KS are good but I found them very clinical in sound, not sure if I'd like use them for many hours. There's a few K5 system second hand.
I would recommend buying second hand speakers as you'll get far more for your money, for example my 5.0 speakers retailed for £5000, and I paid around £1000 for them. High end speakers for low range price.
That Q Acoustics doesn't have bipole rears, I would recommend you try swapping out the rears with this type. Having a surround speaker right behind you, in a small room is very distracting (and that's even with the levels calibrated)
http://img.canuckaudiomart.com/uplo...initive-technology-bp1x-surround-speakers.jpg
Regardless this driver size (Q Acoustics 7000) can only do so much. You'll find you'll have to use an incredibly high crossover point. 95hz, and that's without any +/- 3dB figure, so that could be far higher (and probably is) Most likely 100-120hz. I would not recommend speakers, or crossovers this high. Basically high frequency some mid bass but lower mid bass being reproduced by subwoofer instead, which is bad.
- LF Units: 2 x 3" Long Throw (Neodymium)
- HF Unit: 1" Ring Radiator (Neodymium)