2 has the best logo, I reckon. It's the sort of bold clean design I always prefer. 7 isn't bad, but it's a bit "Made in Taiwan 1981". The sort of thing cheapskate CEOs draw with a ruler in 10 minutes for their company logo and think they're clever to save paying a graphic artist!
All the type is fucked except for 5 & 6, which are just bland. The ascenderless (cyrillic) K is especially horrible.
I know the brief said "sterile, mechanical and heartless", but you should rebel a bit! If you proffer something superb, the client will be delighted in any case! How many logo suggestions do you intend showing the client? Not more than three, I hope. Two good ones and one crap.