There's loads of good cases out there so perhaps it would help if I told you some of the criteria for what makes a case brilliant.
Good caseflow - position of fans, whether you want ATX or ATX upside down. Have a look at this article:
http://www.short-media.com/review.php?r=230
I recommend you have a fan exhausting either at the top-upwards or rear-backwards. Having a front intake to cool your hard drives can help to improve the reliability of your hard drives.
Enough hard disk,optical and 3.5inch bays. I recommend at least 2 hard disk bays, 2 optical bays and 2 3.5inch bays.
Quiet - mostly this is linked directly to 120mm fans. 120 mm fans move slow and don't give that high pitched whine of other fans.
Light - usually means aluminium construction, alos helps the heat exit the system.
Removable motherboard tray - not essential but it will help you live longer as it will lower your blood pressure during construction.
Whether you want the thing to be moveable (ie has handles, is slimer or is wider-and-shorter).
Tool-less design is perhaps not needed (most people have a screwdriver or two at home) but having your hard drives mount across the width of the case allows you to pull them out easier than if they are aligned along the length of the case.
Some other things to think about
You want it not to look like a dog's dinner?
Mounting joints that are rubberised help stop vibrations but my insensitive ears can't tell the difference.
Cubby holes and extra space for extreme cooling solutions - places to sit external radiators.
With that knowledge you can now look at cases and judge what is suitable for your needs. Just in case (pun not intended), here a review site:
http://www.bjorn3d.com/content.php?cat=8&Submit=Go&viewcat=1
Some other things
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