I am not worried about the watering. We are a careful lot.

Can the EP500 handle 30 lbs on top of it, structurally?
Does the enclosure itself vibrate much when playing loud bass notes?
How will a mass of wet soil immediately above the woofer affect the sound?

I don't really like the idea, but if the plant gets put in the corner then my subwoofer plans become complicated. (The EP800 is unlikely to fall within the budget, Dana.)

Axiom M80s + QS8s + VP180 <-- Pioneer VSX-1120-K <-- Squeezebox Touch / XBox360 / Oppo BDP-93