We use a Fisher Price Aquarium Healthy Care high chair that we lugged back from Canada, but my friend has been able to get a similar model (not the same, but very close) from Toys R Us. I really like it.
The trays are detachable for easy cleaning; the seat (cover) is detachable and is made from a material that's easy to just wipe stuff off.... adjustable height... really cute marine design, too! It also comes with detachable toys to keep baby occupied while you're busy preparing his food (within view of the baby in the highchair, of course!).