If you can get that CoolerMaster HAF 932 for under $100 that would be a great deal, the case has one of the highest rated thermal performances out there. Gets a lot of flak for being kind of ugly, but I actually think it looks ok.
I use the Antec 900 (Newegg
http://www.newegg.com/Product/Product.aspx?Item=N82E16811129021 ) which is one of the best cases I've ever had. You can usually wait for a Newegg deal to get it around $80 and/or with free shipping.
If you're looking for something a bit larger, one of the older Thermaltake Armor series can usually be found for under $100, also a great case.