Ellen's high chair recommendation comes with a liberal helping of dry humor:
A year or so ago we bought a Keekaroo, a stellar wooden feeding chair that gives great support. We got ours with a supercushy plastic cushion that's easy to wipe down. It's for tots ages six months up, and can be adjusted to fit someone up until (so says the site) 250 pounds. I'd say that if your child hits 250 pounds, you've been using the feeding chair entirely too much and need to go find a hobby.
I love high chairs that can grow with a baby, look nice, and not take up the entire kitchen. Are there others you'd vouch for?