Help With Which Phone To Buy?

I'm thinking about getting a new phone, buying outright cause of my plan. I want a Samsung cause I'm really happy with all the Samsung phones I've had so far.

Thing is I want a phone that has the duel use, like touch pad but also the full keyboard like a computer (I don't know what its called)

And also the thing about the touch screen is that I need one that will work with my fingernails. I'll explain what I mean. My mums LG touch phone, I have to use my fingertips to type a msg. My sisters phone I can use my fingernails. They are fairly long and I don't want to cut them really short.

It sounds like a tall order but any help would be great, Samsung brand is my first choice but I'll consider another brand if it has what I would like.