Congratulations on breaking your duck!
As always, there are no hard and fast rules, only guidelines. My lounge is only a tad larger than yours and I had to sell my floorstanders (B&W DM603s3) when I moved in. I'm on my second pair of standmounts now (PMC TB2+). The other thing to bear in mind with a room of that size is how close to the wall you want your speakers to be. Some speakers need space around them, others benefit from being close to the wall and some (like mine) are reasonably neutral.