Out of the first 3 you posted the COOLERMASTER PRAETORIAN 730 is definately the best looking (IMO). Infact its the only one id say isnt ugly, maybe its just me
personally tom, i would go with the coolermaster. it is much more "clean" looking. i think you would find yourseld becoming sick of the... ummm... "strangeness" of the first two. the novelty factor would wear off.
I just think that it all looks a bit plasticy. The temp monitoring and fan control looks like plastic and it isnt as nice a finish as the other - does have good reviews though