id say a good designer tank is would be high quality.
Where are you & are you thinking freshwater or marine?
It's difficult because everyone's ideas and experiences are different. Some people like one brand and other's don't. The well known Ferrari F50 type tank would be Jewel or Fluval (or even like you say AquaOne) the Unmarked Police Car-type Skoda Octavia would be a lesser known tank like a Sea-bray or Blue-Seal, it doesn't reflect quality though and everyone's ideas of a good tank are different... Can't go wrong with Fluval though!!!