there are tons of great cases out there. Anything ATX should fit your computer without issue, but there is a wide variety of style out there with cases. Personally I like ones with very simple outsides, with lots of space inside, while others like lots of lights and such.
Some of my favorites are:
Most of the upper end Corsair cases, especially obsidian, and graphite series (not a huge Vengance fan, but they are good too). Graphite White edition is what I kinda want at the moment.
Anything made by Fractal Design is awesome and looks great
Zalman cases are a little ugly in my opinion, but good quality and cooling capacity
Cooler Master CM690 II (currently using an older first edition of this), and the Cosmos II, not a huge fan of anything else they do though.
Thermaltake Level 10 looks awesome. V3 Black edition is a solid budget case that I used for the last 2-3 years until the CM690 fell into my lap, but I would not spend more than $40 on the V3 (got mine on clearance at microcenter for $30 before they resurrected it). Other than those 2 I would generally avoid them as they tend to be a bit pricey, and their build quality is so-so.
If you like more unique designs then look into inWin or Lan-Li. InWin is not all that great, but they have some cases that are really neat like the one my wife's system is in which is white with a bunch of purple vector-art flowers on it. Lan-Li has some really cool designs, and good quality... but they are a touch on the pricy side.
Lastly is Antec, which has some good ones like the P and Sonata series.
For a general rule of thumb here are the things you want to look for:
-front panel IO, especially things like eSATA and USB3 can be really useful
-Bottom mount power supply (it can add years of longevity to your power supply's life compared to a top-mount... though if you have good ventilation to begin with it should technically not make a difference)
-tool-less, my wife's PC is a pleasure to work on (on the rare occasion that I need to) because I can do everything without having to go rummaging for the screw driver. Just pop it open and start breaking stuff
-minimum fan size of 120mm. 80mm fans are loud and annoying, even some 120mm fans get on my nerves, but good 120mm fans are pretty quiet, and 140mm fans are even better.
-Cable management: Most cases have this now, but you want plenty of space to hide stuff behind the mobo tray, and cut-outs or rubber to pass your cables through to the front. When you spend money on a high end system you want it to look nice inside, even if you don't have a side panel it will make you smile to see everything all nice inside when you have to work on it or install an upgrade.