Then whatever has at least an i5 + 4gbs of RAM will be fine, maybe throw in an SSD, I'd look for a thinkpad, the keyboards are nice. unless you want battery life, then just get something that's new
@Streetguru thanks will have a look at it. @Vandal85 yea was looking at the surface but with keyboard/pen ur looking at 1k then i may as well just go f it all and spend an extra 400ish on the surface 4... the yoga is an interesting option, especially with linux considering their recent history... will have more of a look :P