To really address your problem, you want a drive that DOES NOT spin down when idle. I've had some external USB/FW drives (early WD ones) that would spin down and whenever I went to use them, I'd always have to wait for them to spin up. Having said that, if I were you I'd just buy my own case from Newegg, asking either newegg or the manufacturer if the controller in the case will spin down the drive when idle. And then just toss your own drive in.