Hi Unraiders ;-)
Thanks a lot. Talmania, to answer you, I need quiet because it will be on top of a cupboard in my entrance hall next to my internet box, so at least at night it has to be dead quiet otherwise my wife will kill me ;-).
Raj, I would also way prefer hot swap bays (that's why at first I was interested by Drobo, but..... no comment.... ;-) ), but I really need a small cube like form-factor (WAF quite important here ;-) ), hence those 2 cases (btw which one would you prefer?). But if you know of a small cube-like case with 6 hot-swap drive, I'll take it (even better if it's cheap).
Anyway, thanks for all the comments guys.