Best Bookshelf/Monitors Speakers? Suggestions

I am new to hifi, and looking for a pair for pair of bookshelf/monitor speakers, preferrably under 2k, to pair with a Mcintosh ma6450 100wpc. I was originally looking at the B&W CM1, but they are very inefficient(84db), so i was thinking about the CM5, or even the 805S ( both 88db). I feel like I am paying a lot for the name with B&W though, and may be missing out on more lesser known speakers.

I am not necessarily looking for the most accurate speaker, but rather a speaker that is dynamic and creates and wide and deep soundstage. bass extension is also important to me.

I have read about the proac tablette 8 sigs, reference 3a decapo, but im not sure if the de capos are a good choice with my ss amp, and if the tablette 8 sigs will have enough bass.

Obviously I would prefer to audition them, but if i can get a highly recommended pair of used speakers such as the decapo that would normally cost much more new, for the same price as a new pair cm5 (1500) i feel like id be better off. what do you think? Thanks for your help.

Extra infor that may be important:
I live in a high-rise so would like to avoid using a sub.
My Room is approx. 16x17.
Couch (main listening position) is about 8-10 feet from where the speakers will be.
Speakers will be about 7 feet apart.
Probably about 1 foot from the wall behind them.