Theres all sorts of different warmbloods out there...Oldenburg, Hanoverian, Westphalian, Swedish Warmblood, Dutch Warmblood, American Warmblood, Hungarian Warmblood, Trakhener, and probably a few I have forgotten.
I like the Donnerhall and the Rubenstein bloodlines. I havent come across a Rubestein that hasnt had a good temperment and work ethic. Donnerhalls are very nice too, both produce nice dressage horses.
As far as eventing, I don't know much, but TBs and WBs are both great for it. I've seen many different WB breeds excel at all levels of eventing, so I guess if you look into some of the upper level event horses breeding, see what crosses you find, that may help. The only thing is there are the WB inspections for the different breeds, I think its mainly for breeding purposes. But some WBs can be registered with multiple registries, like some Oldenburgs can also be registered with the American Warmblood Society....i think. I could be wrong about that, but im pretty sure that Donnerhall was regitered with a few different registries.