Is security an issue for you. If these are a bunch of guys you know and trust then I agree withthe guy who said "faux clay". They lack a bit of style but they feel and stack great and they are cheap. The super diamonds are also nice. If, however, security id an issue then I would suggest the Nexgens because they are ideal for putting on custom labels.
Super diamond
http://www.5stardeal.com/deals/10Exp...ctCode=10-1010
Faux clay
http://www.5stardeal.com/deals/10Exp...ctCode=10-1600
Good luck