I recently built my HTPC using the Silverstone GD05B-USB3.0 case. It seems similar to the case you are referencing except that it only has one external 5.25" bay, only supports up to Micro-ATX boards, and it is smaller. The GD08 seems rather large; it would be too large for my setup. I'm sure you have considered the case size, but I mention it on the off chance that you have not measured your space. Also, bear in mind that you will need some space for the fans/venting to work properly.
The only issue that I had with the GD05 case (and it really is not the fault of the case) is that the case fans must be plugged into the motherboard for PWM to work. My motherboard only had one case fan header pin. It would have been beneficial if the fans had a switch to reduce the fan speed. You will need 3 case fan header pins on your motherboard for PWM function to work properly. Of course, the GD05 case came with a molex adapter to plug the fans directly into the power supply. However, the fans then operate at full power, which I found to be too noisy. So, I replaced all of the fans with Antect TrueQuiet 120 mm fans that have a switch to reduce the fan operation to low power. The HTPC is now near silent and stays cool.
I'm not sure what information is displayed through the IMON interface. However, I can say that with all of the gear that I have up by my HDTV in the living room, including HTPC, media server, cable modem, router, switch, AVR receiver, Blu-Ray player, and Wii, I would not want another LED or LCD component up front. The only information that I lack and would want is that the HTPC is currently recording something. If the IMON interface provides that information, then I might reconsider.