Do the Vandies sound good in that room in the same location? If they don't, its most likely the room, not the speakers.
I'm not saying there's no reason to change the speakers, just suggesting to make sure it's the speakers before you start throwing money at something that's not possible to improve on significantly. Some speakers certainly image and soundstage better than others, however I've personally found a lot of that is due to the room and placement within it.
If you want smaller speakers that image and soundstage all over the place (provided they're in the right place), check out the Totem Arro. They need a bit of space behind them, but I think they're relatively forgiving of placement.
They do however need stable power. Not an enormous amount of watts, but an amp that can handle lower impedences without straining.
