Iron pro line tsuba from the pro model #12.
Limted time offer: Includes a free pro line iron fuchi and kashira
Musashi had it right; the simple, double-c style Tsuba is the way to go.
It's a bit smaller in diameter than other Tsuba I've had, but that in no way is a disparagement. This particular piece saves on weight without sacrificing stability and durability, and all you lose in the process is a bit of flash you might find in engraved or painted Tsuba.
Personally though, I find this simple piece aesthetically pleasing in its own way.