Craig, my thoughts on "audible difference" are no and also no on sand or shot except as Dave suggested, to make it less likely to tip over.

As far as height goes, when I got my M22s I experimented with a specially designed variable height stand(i.e. stacks of old magazines)and concluded that 16"-18", putting the tweeters just below ear level, was about right.

Get something that looks better to you at the best price you can find.
Maybe the first two from this outfit would be acceptable.

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Enjoy the music, not the equipment.