We have one of these...
linky
I've tried about 8 different kinds of highchairs, whether my own or families and this one is by far the best
It clips onto a dining room chair so then alex is eating with us. We don't have to find space for it. He sits upright, doesn't slump or fall to the side like lots of the big highchairs. Its really easy to clean and the tray is at the right height, alot of the ones I've tried the tray is too high so you have to put a towel under them to boost them up. I also like that later you just take the tray away and it becomes a booster so he can eat at the table with us normally.
Fancy highchairs are the worst in my experience. They are awful to clean, usually big and bulky so take up lots of space and the chair itself is just too big so they slump badly or fall to the side. In my mums fancy one we have to put a towel on each side of alex or he falls to the side.