Verified answer

no need to buy media reader since it's too common to use a USB reader for TF, SD cards.

Dual Video Cards is useful but I rather use the money to buy one good card such as GTX560 which is more than enough for gaming.

A media reader is only necessary if you want to plug in things like SD-cards, Compact Flash cards, and other stuff.

Is it necessary? No.

But it has no relationship to dual video cards, so there's no point in your last question.