A 2-way monitor is a near ideal solution for most. My caveat is to make sure it provides mid-bass body as many current designs sound thin. In my experience 6 inch mid-woofers are ideal. Below that, best to turn the bass duties over to multiple dispersed subwoofers, ala Floyd Toole et al (swarm as per Duke LeJeune from AudioKinesis here at AC). IMO too many designers are trying to go too deep with a mid-woofer which muddies the more critical midrange via thermal distortion and excessive x-max. Trouble waits if you try to go much below 60 Hz with a small 2-way monitor.
According to Toole, the bass wave (versus mid/high ray) phenomenon occurs up to roughly 140 Hz (room dependent) where the multiple dispersed subwoofer/swarm theory applies. This can be illustrated by moving a hand lengthwise in a shallow bath tub and watching the waves interfere as they travel. The most effective solution for the entire room isn't treatment or EQ/DSP but semi-randomly dispersing multiple bass sources in the room. However the ear can localize sound above 80 Hz, so some individual tailoring of each system (gear/room) is needed to optimize results.
My Dynaudio BM5 MkIII monitors ($1400/pair MSRP, 1"/7" drivers, F3 = 42 Hz, active design rated up to 118 dB) don't sound thin but run into trouble going deep at spirited listening levels in an average room (2100 cubic feet). Fortunately they come with 60 Hz and 80 Hz cutoff settings for use with subwoofer(s) and I have DSP on hand to further tweak.