A while back I was given a Cobra top by forum member jrodriguez. It's a very nice small top. He praised it saying it was well suited to gravity tricks due to its configuration and light weight. I also have a Pegasus and Galaxia top. They are light weight and their design seems to copy / follow the Duncan Imperial with the crown that clips into the body of the top. You won't find many folks praising the Duncan Imperial.
You mention in your post that you will need a durable top. The Spintastics tops are very durable and the tips are replaceable. I have only had one Trompo Grande break - and that was due to a two story fall onto a concrete floor. That was a sad day. You may find some recommendations from forum members for Mexican tops but I don't see anyone using them regularly. There is, however, lots of love for the QSH (I include myself in this). It will get battered and worn but if you keep a few replacement tips on hand you'll be able to use it for years.
Two pics attached. The first is for size comparison: Imperial, Galaxia, Pegusis, Trompo Grande, QSH. The second is a photo of my blue QSH showing it's age after 4+ years of use. I have several QSH tops and I feel like the kid in Willy Wonka who wants more than one Everlasting Gobstopper. They are so durable that you really only need to buy one.
Good luck with your decision.