IME, a small room such as yours wouldn't suit a floorstander that can give the deep bass required for convincing reproduction of bass-heavy music without suffering excessive upper bass and, probably, muddled lower midrange too. I would also wager that Monitor Audio Silver 100's would give a similar effect in your room. So I would also suggest using a sub with a small pair of standmount speakers (or, if you particularly like the form-factor) small floorstanders. Have to say though that in this price bracket, standmounts often sound better than small floorstanders. One important point, IMO, is to ensure that the burden of deep bass can be removed from the stereo speaker pair when used with a sub. Sometimes the sub can do this or some amps and preamps can. Doing this allows the system to play louder and cleaner as the main speaker pair aren't stressed as much.
Lots of good suggestions already but I'm compelled to mention an alternative approach that, from experience, should give superior audio quality (though may not suit for other reasons) and that's a system based around active speakers, often called active nearfield monitors. For all sorts of reasons, they tend to offer better sound per pound (no hiding from the fact that I'm an active speaker advocate!).
A decision needs to be made at the outset of system building because different components are required (i.e. a preamp rather than integrated amp) to build a setup around active speakers. Worth looking into although info in hifi mags is minimal as you won't find reviews of such speakers sandwiched between adverts for £1000 exotic cables, reviews of speaker isolation cones, mains conditioners, £3k equipment support platforms etc. - which probably says it all.
Suggestions:
Dynaudio LYD-5 (two required.) £622
used with...
Dynaudio 9S B-Stock £699
or
Focal Alpha 50 Evo (two required) £418
Focal Sub One £698
many, many other possible combinations including some domestic orientated subs such as:
SVS SB-1000 Pro (Black Ash) £639
I think the BK subs offer better value but they don't contain the circuitry to remove deep bass from the main speaker pair.
As for a pre-amp:
Amazon product
No wifi, just bluetooth.
Also, check out the Edifier range of active speakers such as the Edifier S2000Pro and S3000Pro. They have versatile connectivity and could be the basis of a great-sounding setup.