Okay, messed around quite a bit with the 20D and Sigma macro this morning. Varied the lighting (which, BTW, is a flashlight - the seedpod's less than an inch long), composition, background, etc. Also decided that I was using the wrong half of the seedpod - the other is more sleek and bird skull-like. Also was MIA, but found it behind the wine rack.
So, after much effort, playing with exposure (this was heavily under-exposed), and doing some desaturation and levels tweaking, I ended up with this:
This is more along the lines of what I was hoping for. The focus is sharp through some of the inner structure, giving a good feel of the texture. There's a lot of contrast, but it's not a battle between completely blown highlights and full-on black. I'm happy with this now, and, I think, done with it.

So, whatchall think?