You're saying to get the cards first, the ones that wont be available again, as the first choice.
Thing is... I have many many level 1 cards. N > R > SR obviously, but still, around 25 SR cards, only 3 of which are level 100, and only 6 of which are 50+.

The EX cards... what can they be used for? I dont have any EX cards, and unless I am mistaken, and the EX cards can be used to send you over 100, they dont seem like a good buy for me right now. But are you saying to get the EX cards, and then trade them to Kurito? Does she actually produce anything good? I've only done a few trades with her, and I had looked at a chart for items values when doing the trades, but was disappointed with each trade. Also... do the EX cards provide more than 1 level when used on an SR card, or an R or N?

The cards that are available for trade. Is there anything special about them? Other than they will no longer be available, I looked them up, and their SED doesn't appear to be anything extraordinary. Is there something special about them I dont know?

Thanks for the help guys.