For #3 - I like its simplicity and the serifed text. I'd like to see what this looks like with a softer blue and more spacing between the logo and the type. I like 5 also, I'm wondering if the tag line is just too long. It ends up being too small. What happens if you remove it?
I like #3 and 18. I also like #5. If I were going without the tagline I would choose 18, but I think the tagline differentiates my company. Do you have any ideas on how to include the tagline, but make it more readable? Could you try it for #5 also.