I agree -- the one in the top right, but with 'IT Services', instead. Bottom left is right out -- I think that gives the impression that you're doing electronics, rather than networky type stuff. My second favourite is the bottom right. I think it's a good idea, and could be improved by taking the 'IT Services' line from the one in the top right (the logo feels unbalanced the way it is now), and by reducing the complexity of the top graphic a little bit (I have a feeling that it would reduce to a smudge of grey). Don't forget, you can have different logos for different applications, so long as there is enough of a consistency between them that they are all recognizably the same company.
Oh, and like that email I just now received told me: Out of ideas? Viagra can inspire you!