Is New Always Better?

I am still looking at computers and laptops. My husband's computer is on i's last leg. Now I'm running into ones that are set up for wireless n. I am wondering if it is really better. I am hesitant because my Linksys router does not handle n, it is a g. Of course I don't know if a wireless n is compatible with a wireless g router. I don't want to invest in a new router, this one works fine for all of the other computers in the house. I think they do this stuff just to make us buy new products.