Fat Daddio cutters are both seamless and evenly shaped. They are a lot more expensive, and they come in a set for which you may not need all the sizes. Also, they're not as sharp. That's the bad news. The good news is that, while more expensive, they do the job (which the cheap ones may not). As for sharpness, a quick bit of sanding with about an 800 grit will take care of it.
I've also got a bunch of Valerie's from the UK. Excellent cutters, reasonably priced. And you get the ones you want as opposed to a big set.
Making your own is fine if you want a unique shape, but I think what you're describing is a standard shape that's precise. Better to buy those IMO.