The powered Mackies seem to be quite the favorite. I brought a pair of M3ti's to my friend's studio just for fun about 3 months ago. While everyone loved them for general listening, they were uncomfortable with the curve for mixing purposes. After doing some test mixes (the m3's powered by a 500wpc QSC amp. Needless to say the volume fader wasn't pushed up too far) the results showed overcompensation for the bass: either they rolled too much off leaving an anemic mix or left it as is creating a slightly bass-heavy sound. I'm sure they could adjust as needed but there's a reason people stick with Mackie, Tannoy, and a few others. Sure they aren't the perfect audiophile speakers but they have ruler-flat near-field response.
