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Id look on newegg.com for a case as all the ones you posted are on there for purchase. They have a case like the second one but with handles to look like the G5 (shown below)
and antec nine hundred is siiick (shown below)
Building your own would be more money and taking the sides off wouldnt be a bad idea if you wanted to plexi it. just make sure you vent it on the sides with some slits and fans. problem with a clear case is that you have to take it apart and dust it all the time, trust me... sucks.. you see finger prints and every spec of dust. hope that helps you some.