Unfortunately, those qualities suit all ofthe species you mentioned. However, Conures and Poicephalus parrots (Meyer's, Red Bellied, etc) are pretty different in demeanor.
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Conures remin me of bold, scrappy puppies that are needy of attention and very physically expressive. Sun Conures have a very loud call, and if they will use it to get your attention. If you ever plan to live in an apartment, you could get evicted due to your Sun's screams.
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Pois in general are more cautious and *think* over their actions more so than not. Pois are also less vocal and quite independent, yet cuddly when time is appropriate. They also have a higher ability in mimicry, not that this guarantees a talking bird.
Here, read this article on the Pois:
http://africanqueenaviaries.com/african ... erview.htm