Lian Li PC60 (silver) or Lian Li PC61 (black) are classy.
Trouble is they about £75.00 and no PSU.
Antec Sonata (Glossy Black) can be picked up for around £65.00 with Antec 450W PSU, that's well worth it. Real classy looking case, that one.
There again, one man's case is another man's poison, beauty is in the eye of the beholder, etc, etc.
I favour plain, solid-looking cases, no frills, no clutter, whilst others like luminous green moulded thingies with flashing lights all over the show.
And I like side windows, encourages you to keep your internal cables tidy and it's amazing what a few subtle strip lights and some UV cables can do