Been contemplating a SG07 or similar mITX gaming build for a while myself, but haven't really looked at the Lian Li Q08 until now. Been awaiting funds, SandyBridge, and now a mITX P67 board.
What are you doing with it? Gaming build, HTPC, general SFF desktop?
Ultimately, I think it comes down to aesthetics, where I prefer the SG07. I don't tinker often enough to be too concerned about tool-less access or sharp edges. Where is this case going? If I had it on a desk I would be mildly concerned about noise coming through the big front fan of the Q08, or if it was on a carpet blocking airflow to the GPU.
SPCR has a review of each, the Q08 seems to be slightly ahead on noise, behind on CPU cooling.