What size of card do you like to make when you do make cards? and what orientation do you like the card to be...
Example, when I do standard rectangle cards they are usually made from a5 size card (half letter size) then folded over, and that gives you the rectangle shape on the front... So do you like the rectangle card to be portrait, or landscape?
I like portrait for rectangled cards.
But I am most fond of Square cards at the moment, that are 6x6 inches. I suppose just because they remind me more of scrappages that way? plus gives you more surface area to wrok with on the fron of the card.
So hope that made sense! lol. Let me know what size and orientation you like your cards to be.