As a forum lurker with minimal expertise and only two logos to my name I'm hardly qualified to comment, but will throw in my few pence worth.
The variety of styles is great - I'm sure the customer will be spoiled for choice.
Even though it looks less modern than the others, the only one that speaks to me of a "hard approach" is number 14 - angular, bold, blocky, no curves. However, the colours don't immediately suggest technology - I agree with an earlier posting that blue/grey might be more appropriate, but that might be down to corporate colours anyway.
James
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