One of the great things about printing your own wedding stationery and paper goods, is that you can select the paper. You can decide how much to spend as well as choose a paper that works best with whatever look and feel your giving to your wedding.
One of the easiest ways to do this is ordering paper online. I highly recommned LCI Paper (I'm an affiliate) one of the reasons is there excellent and vast selection of paper stocks and matching envelopes, and they cater to people printing at home (yay!)
I'm a fan of sticking to the basics. For most e.m.papers wedding printables a basic, bright white stock like this work just fine. One or two 250 sheet packs should cover all the paper needs for your invites, save the dates, rsvps, menus, table numbers and place cards. Plus, A box of 250 matching envelopes will only set you back $36!
This kind of bright white stock would work best with the following wedding card designs: