I know you like your stuff vertically, but you might consider this rack from
Studio Tech.
Max capacity is 350 lbs. I added an 9" shelf. The TV sits pretty high, but after a getting used to the new height, I prefer the elevation. I also added the the
Super Cone Spikes. It's rock solid with no movement.
While it might not hold your popcorn maker, you might consider this. It easily fits my 56" DLP. It is also holding an LPA-1, Onkyo 705, AudioSource Class T amp, Cable Box, DVD/VHS combo player, XRT12 XM tuner, Toshiba HD A-3, Monster 3600 Power Center. Just for a feeling of size, those are RTi10s to the side and a CSi5 center on top of the TV.
Below is a crap picture, that I took a month ago. A friend of mine wanted to see the HT. I'll take some better pics and get them in the system showcase eventually.