I feel like my ideal screen size for a laptop is 14". 13" is just too small for my eyes, but the other common size, 15.6" just makes the thing unwieldy.
I have a 14" i5 with a 1090x1080 screen, but it's a ultra low-power thing so it's only a dual core, which makes it more of an i3 and at times it just feels sluggish... but I also have a 15.6" i5 that's a proper quad core but with a 1366x768 screen.
I wish I could just mash them together, but the CPUs are soldered directly, so no sockets for me