I love that 9.0 JLA #29! Beautiful book! I've owned a Good copy for decades but I've been on the hunt for a nicer copy for a couple of years but to no avail. (Well, at least when the budget has presented itself. )
I'm not sure if I'll ever slab any of mine. I still have about 10 or so books on my list to upgrade but I'm pretty content having completed the run in May. I still need B&B #28 & #30. I foolishly passed up a great deal on a B&B #28 last Fall because I was afraid it might have been restored due to the price on it. As for the B&B #30, I seem to always find beat up copies at list or more that I don't want, or HG copies out of my budget. Ah well, I'll get it some day. You need these quests to keep the hobby exciting.