What price range?
Basic case is $50-80
Better case with more features, design, and quality is $80-120
Real good case $120+
PLease tell what features are more or less important:
Price
Overall quality
Appearance
Quietness
What features do you want? Required or just nice to have?
Number of internal hard drives
External drives
Special external connections? eg Front USB or Audio or eSata or Firewire
Go look at some cases and report which you like just from a style point of view - there is quite a variety and it is very subjective
Just from a standpoint of quiet and good quality - the Antec Solo III (comes with PSU) $80-140), and Antec P180 or P182 ($100-140)
More basic cases - simple design Coolmaster Centurion 5 ($50), Coolmaster Centurion 590 $60), Coolermaster 690 ($85-110)
Gamer basic case - Antec 900 - ($70-110)
But there are lots of others and the choice is very subjective.