What Todd said. If you place monitors on rigid, non-resonant stands, properly placed, you almost always get killer imaging, particularly when the front baffle is small and sculpted to minimize reflections off the baffle and edges. On a budget the PSB Image B5 and B6 will give you a lot of what you're looking for.
You can also enhance imaging by integrating a subwoofer (or two) into the rig. There's something about adding the foundation that makes everything else pop out more.
Generally speaking, the ones with the least front baffle area and with some sculpting to avoid refraction distortion. Monitors are usually 2-way speakers, simplifying the crossover scheme and providing some advantage in maintaining phase coherence, which is another element of throwing a good soundstage with good imaging.
At a higher price, but not insane money, the monitor I really like is the B&W PM1. I heard a pair in a demo with B&W's PV1D sub. The overall effect was engrossing in every way--timbral accuracy, pinpoint imaging, dynamics, pace, etc. I had just previously heard the Wilson Alexandria XLF's, and this PM1/PV1D combo communicated a great deal of the same musical truth, albeit on a smaller scale. Matched to the right room size, though, the PM1/PV1D doesn't sound small at all.
You can also enhance imaging by integrating a subwoofer (or two) into the rig. There's something about adding the foundation that makes everything else pop out more.
Generally speaking, the ones with the least front baffle area and with some sculpting to avoid refraction distortion. Monitors are usually 2-way speakers, simplifying the crossover scheme and providing some advantage in maintaining phase coherence, which is another element of throwing a good soundstage with good imaging.
At a higher price, but not insane money, the monitor I really like is the B&W PM1. I heard a pair in a demo with B&W's PV1D sub. The overall effect was engrossing in every way--timbral accuracy, pinpoint imaging, dynamics, pace, etc. I had just previously heard the Wilson Alexandria XLF's, and this PM1/PV1D combo communicated a great deal of the same musical truth, albeit on a smaller scale. Matched to the right room size, though, the PM1/PV1D doesn't sound small at all.