I like this one the best so far... might work to make the red part of the snake/circle thing the same color as the logotype. That would tone down the super-bright colors a bit and tie the shape of the logo closer to the logotype.
@ CrossingZero - I'm not really a fan of this one... I do like the Font (or type, however it's called). Not a big fan of the graphic - It just doesn't say much to me about anything technology and it's not strong enough, imho. Take that for what it's worth, of course... I ain't no artistic expert.