A few things to consider. Always allow room for expansion. You never know when that 2nd or 3rd CD-ROM is going to be needed. Try to get the most out of any layout. Weight is not a bad thing.
Light cases tend to be a bit on the flimsy side.
Is it customizable for fans, hard drives, etc. 5. The more fans and peripherals you use, the more power you are going to need. Go for at least a 300 watt PSU if at all possible. I needed to find a high quality testing platform that could withstand a steady diet of new hardware, have lots of room to work in, and be totally customizable for overclocking. With it's full tower configuration and awesome capacity, this case stood high above the rest.