I have to agree with Chyros, I think this weeks can be chucked down as 'testing the waters'
I'd like Drag's a bit more if he used the original colours of the image in the background. However his background fits the render the most (it's got a vintage feel to it).
I think Nem's is the most polished, but is a bit too wide (not that making it shorter would improve it, the render was hard to work with).
I messed up my text (I tried something that failed) and the background could do with softening.
Bob's could do with some colour coordination between the render and the background, however it's the most interesting use of the render and would (out of the four of them) be the one I'd most likely use as a sig.