What size? What style do you like etc? We could go on forever if you don't narrow it down
I've been looking at making a new PC later in the year and so far quite keen on a few cases.
Raijintek Styx classic – stylish, very nice and clean.
(mATX)Fractal design Node 804 – lots of space, power button/ports on right hand side of case.
Corsair 600Q – Sound dampened panel option (select right model!), inverse layout, fairly small though but lovely steel exterior.
Seriously I've got a list of about 20 I'm considering..