Get an Asus T100TA Windows 8 tablet. Comes with detachable keyboard dock and USB3 port. Battery lasts forever. Problem solved. (I own one after my Dell Venue 8 Pro was dropped and destroyed).
Sorry, misread. Will have to be a Windows 8 tablet if you want to do all that. Personally, I just have a laptop and a tablet. I feel like those Windows 8 products don't do either well, are kind of in-between devices.