I've never owned a Speed Passion but the older GT series always seemed to be pretty good but I've seen many people have issues with the Reventon series. Some of these issues have been resolved but just seems to me that there have been far too many problems.
The Orions are good and reliable, but expensive. Thunder Power motors are good and quick, I have a 8.5 in my KF and its plenty quick enough! I also use Viper speed controllers which were cheaper but now there imported by CML the price seems to have gone up! The Absima units seem ok, not seen many running though but they are more affordable.
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