Realizing that ears and amps and systems and techniques are different, for precise monitoring, Aurasound makes the flattest, uncolored speakers, at a reasonable price. If you prefer color, though, Tannoy 600s have a distinct low end, a frothy high, and a delicate wallet for a compact near field mon. Try them with a mild cheddar or smoked gouda.
Your best investment might be in a switcher, where you can switch to different monitor experiences (cheap cue speakers, cheap big boys, and your main monitors, frigzample).