I actually decided to go with this little number:
http://pipesandcigars.com/gacimamar.html
Which, ironically has a plastic frame, but it's apparently sturdy plastic and is a dream to clean. Plus, I finally found a use for my dwindling supply of pipe tobacco - I can now break it apart and smoke it instead of having to mix it with anything to get a decent-sized bowl.
Thanks for your help on this!