I'm dying to get a nook (just to add to the collection

)
Is there a big difference between the color and the tablet? Also can I upload my own videos on them from a sdCard? If so what format?
I'm probably leaning towards the Tablet - I see there is a 8GB and 16GB - It really should not make a difference which I get, since I can use a SDcard right?
Sorry for the babbling....it's Friday, my boss is on vacation and worst of all the Coffee machine is broken!
Thanks!
Kat