I got to hear the Blade and the LS50 back to back at a show in 2012 when they were new. I thought the LS50 imaged a little better than the Blade. The Blade imaged very precisely. The LS50 did too, but it also threw a bigger soundstage, even though they were placed a little closer together than the Blades.
Pretty much any small two-way stand-mounted speaker with mid-woofers in the 4-5.5" size range will image very well. The best I've heard for that are probably the Raidho D1. The best I've owned in that size range are the Focus Audio FS-688. The original Totem Model 1 with 5" Dynaudio woofer was also in the same class as the Focus Audios. I've also been impressed by the Penaudio Cenya Signature, Joseph Audio Pulsar, Harbeth P3ESR, and Paradigm Atom.
A lot of 2-ways use 6.5-7" woofers, and it seems to be a little more difficult to get top-notch imaging with woofers of that size. But one that impressed me a whole lot was the Wilson Benesch Vertex, which I owned for a while. Dynaudio C1 is another. Among floorstanding speakers, two of my favorites are the Magico S1 and Dynaudio C2. I've owned the C2s for 12 years and have no desire to upgrade them. They really excel at providing a big, expansive soundstage. The Magico S1s don't throw as big of a soundstage, but the micro-details around the images of instruments was very impressive.
Omnis are worth a mention because they can create a soundstage that remains stable as you move around the room. When done well, it's an uncanny effect that makes you feel like you can walk around and in between the performers. Usually, the imaging is more diffuse with omnis, but one exception was a show demo of the MBL 126. That was a wow moment. My wife was floored and encouraged me to buy them, but they were too expensive and too bright to my ears.
On the other hand, I've generally been less impressed with dipoles, possibly because room and setup is so critical. I've only heard Maggies a couple times, and not in a good setup. People say they can produce life-sized images, but I haven't had the chance to experience that. I did hear the top of the line Wisdom Audio planar magnetic loudspeakers in a very large hotel suite powered by Simaudio and augmented by subwoofers. That setup produced the biggest soundstage I've heard, and projected larger than life images into the room. It was very impressive, but somewhat unnatural.
I have more experience with electrostats, but my impressions are mixed. I've heard very good imaging from Martin Logans, but only in the sweet spot. If you move a foot left or right, it breaks down. Planar electrostats like Sanders and King Sound are even more finicky. If you want to be constantly moving your head around chasing their elusive and micro-sized sweet spot, those are the speakers for you. One electrostat that really surprised me was the Quad 988. They're designed with stators arranged in concentric rings, with delay lines to emulate a point source. So I expected them to sound more omni-like, but I was very wrong. They did have a wider sweet spot than other electrostats, and the images were precisely positioned, but the soundstage was smaller than I've ever heard from any other hi-fi speaker. It was like listening to a hamster orchestra.
Finally, I'll just say that I've rarely been impressed by the soundstaging abilities of large three-way speakers, even in really good rooms.
HT: Dynaudio C2, Contour S CX, 2x BM14S, Aperion surrounds, Simaudio Titan, Marantz AV8801, Oppo 103, Linn Majik DS, and a Pioneer Kuro
Stereo: Dynaudio Focus 160, Simaudio W-5 LE or Luxman M-600A, Linn Akurate DSM, 2x Rythmik F12G
Other interests: motorcycling, skiing, being active