I have a big Bruin chair on wheels, with a tray that you can remove & wash, a 5 point harness, reclining seat etc. But, to be honest, I find the full high-chair annoying. I have packed it away because it takes up too much space & just gets in the way (and DS likes to push it around the house ).

I prefer the Fisher Price portable one (The "Healthy Care Booster Seat"). It has a 3-point harness (which is fine - so long as your bub can sit up - and you don't start solids until they can sit up anyway - it's a sign of readiness for solids). The tray then snaps on over their legs for added safety. The chair just clips onto one of your existing dining chairs. It's all smooth plastic (no padding) - so it's really easy to clean. It has a removable tray that goes in the dishwasher for easy clean-up. Best of all, it takes up very little space & can quickly be folded up when you want to go out.

But, if you want a full high-chair, here are some things to look for:
* height of the tray (mine is too high so DS looks uncomfortable when he's eating & drops food down onto his tummy)
* material of the padding/seat-cover - you want something that is easy to clean (eg. PVC), not something plush (babies make an enormous mess once they start self-feeding)
* removable straps - for cleaning (believe it or not, some highchairs actually don't have straps that you can remove to clean!)
* adjustable height - our high chair is called a "high/low" chair & you can move the seat up & down - which is great if you want to feed bub while you are sitting on the couch vs. at the table

HTH