Nook Tablet has dual core (color has single), same RAM from what I understand. If you want to root it, the nook color is a little easier to root from what I understand.
I also bought a nook color for 59, but I think I'm going to keep it, because I just need some web browsing and basic pdf reading. Nook color might be sufficient for you, unless someone else knows better than me.
That being said, I think Nook Tablet for 79 is the lowest I've seen. Fry's had it for the same price Black Friday, but they charged 6 dollars for e-waste recycling fee for California residents.