If we want to ensure that there would be enough hits for everyone (28 spots) at least once over, a couple high-end boxes or a high-end case might not be the best.
A 2012 Contenders Case would come out to an extra $28 or so per member for product cost, shipping and supplies even after the gift card. Would be 60 autos though, a nice haul.
A couple options that might be good if people don't want to chip in that much extra:
1) 2012 Topps Magic 12 Box Case -$999.95 - 36 autos and a chance at relics. (Release 2/8)
2) 2012 Panini Totally Certified 12 Box Case - $1299.95 - 72 hits. (Release 2/27)