well, about 4 months ago, i was in your shoes. needed a new case and had no idea where to start. soon after i found myself looking at lian li cases. again, like you, i had no idea what case to get. after weeks of research on the net and lots of coffee, taco bell and coronas i landed myself the big one.
http://www.newegg.com/Product/Product.asp?Item=N82E16811112105
this case is huge. lots of room to work in, room for tons of expantion and (for a lian li) reasonably priced, its also in your budget, for the moment. this is my first lian li case and i have absoluly no regrets. i modded the hell out of this case. have a huge side window, mounted a cmos clearing toggle switch under the front panel, two case handles on the top, and a triple 120mm fan radiator for liquid cooling on the top. everything in this case is removable for easy installation of all your gadgets. two spots for power supplies. two 3/4 pin 120mm fans which are very quiet and high quality. to sum it all up lian li = quality. you will NOT be disappointed.