Honestly if you're looking for a full ATX case under 10 lbs it's either flimsy as hell or an exotic like the Lian Li. I'm not sure I'd favour either option TBH - why not just wait to upgrade to let's say the BitFenix Prodigy
with your next build (which, I might add, is still more than 10 lbs even though it is an ITX case - but it's not a flimsy one).
At first I was pissed at your response...WAIT!?? WHY WAIT!? But after about 20 minutes of debating, waiting just seems like the right thing to do. Trying to cram this huge board into a tiny case is causing a pain in my ass, as I have to really dig to find a case that does what I want. *Sigh* rebuild time.
Thanks for your help FinneousPJ!