Check with board member realitytrip via PM ...don't know if you would consider it to be a near set, but he may be able to help.
Only time will tell how the prices will go on 35 centers. I've been tracking them since late 2002 and yes 30 cent prices are down for mid- and low grade "commons" and prices are down on some low grade 35 centers as well but still over $20; the surprising figures as of late are the $200+ on certain copies that I thought Glenn, Terry, Derek and Sandro ALL had in high grade already; so I was taken by surprise a bit on high recent ending prices...just when you thought it was safe to start collecting 35 centers
As for the double cover 35 center, it WILL NOT BE split up to be resold as two...
IMO, 35 centers like Ms Marvel, John Carter WOM, Eternals, Invaders, HOward the Duck are probably going to be the ones to dip in price first. They are fairly common and most of the big boys probably already have high grade copies, so unless they are hoarding (even if they are, there comes a price point where it's no longer worth hoarding at)