I use Domtar 28# cream paper (5.4mil) for my album pages but also have some Staples 67# cover (8.5 mil) as well for misc use like cover pages (first page in binder). If I wanted something stiffer for all pages, 67# cover would be good. I have the Staples paper. The cost is around $15 for 250 sheets.
Al Mission: To collect and preserve Member APS, PNC3, ISWSC, ATA, FICS, SOIS