In my book, if it needs wheels it’s not hand luggage 😆
I fly far too often and I don’t see any reason to spend big money on luggage – it invariably gets knocked about a bit, and there’s no pose value with it.
If you fly with the budget airlines it’s handy to have a soft bag – you can cram them into the luggage gauge if needed, but they attract far less attention from the staff at the gate, so you rarely get checked. And on the flights where there’s too much carry on baggage and bags need to go into the hold, and they always pick all the people with hard bags and small cases.
IKEA do a backpack on wheels which is pretty cheap. http://www.ikea.com/gb/en/catalog/products/50217766/
My other go to place would be Decathlon – they do a lot of decent soft bags at fair prices.