I'm trying to find inexpensive packages of white card stock on eBay, to use for programs and possibly an invitation insert if I'm feeling ambitious.What weight would you recommend? I want something that's easy to run through a regular home printer, and something that's going to be nice and stiff (that's what SHE said!). Or is it "cover stock" that I want? I'm looking at Staples.com and I don't know if the paper gets thinner or thicker as the weight number increases. TIA for advice.