I bought my kids Delsey from Kohl's during their 30% off sale plus. I think I paid about $70/bag and I love them. They're light, have an expandable top to fit A LOT more stuff (but won't fit into overhead if expanded). If it's top heavy, it doesn't tip over as it has "legs" on the front/bottom to rest on. The wheels are great and smooth. The telescoping handle is very quick and smooth. They also have a lot of inside storage options, baggies, nets, straps, etc.
Oh jeez, I had no idea you already selected a bag, LOL. Matter of fact, I didn't realize this thread was as old as it is! Oh well, I'm getting some good suggestions here as I need a carry-on for our upcoming November trip.