No easy answer to that one as too many variables unknown - room size, possible position of speakers in room, partnering kit, your state of hearing etc.
Not wanting to appear awkward but speakers / sound is a very personal thing and the only way you are going to find the right speaker is to listen to as many as you can, preferably in you own room. Not always easy I know but its the only way.
Are you considering second hand for that price?
I think your best bet is to read through the reviews section and try to audition some of those listed, and don't just limit yourself to the 5 star ones, that can sometimes be a big mistake.
Might I suggest you start off with MA Silver RX6 or B&W 684's as these are happy in most systems.
Personally I would go for standmounts when choosing speakers below £2000 but as i say its all down to personal choice