My mother swears by samsonite. She's had her suitcases (and used them a lot) for more than 30 years (21st birthday pressie) and they're still going strong!
Mine is from Antler, which I think were probably cheaper but it seems to be pretty good.
I guess when looking at wheelie bags the big question is hard or soft? I have hard cases (pressie so I didn't choose) and they're great for keeping stuff safe when they're thrown around by baggage handlers, but they're also heavy. My check-in size one is 7kg empty and my carry-on is 3kg empty. That's a fair bit when you compare it to the limits (20kg and 7kg, usually). I pretty much can't fill up my big case without it going over the limit by a reasonable amount. On the other hand, a soft case will be lighter but it's also much more likely to get destroyed or have stuff inside get destroyed.
My advice is: don't go cheap. Get a decent brand one, even if it costs twice as much. Have you ever see someone trying to haul around a wheelie bag after the wheels have fallen off?
