You have just described the perfect scenario in which to use a netbook. I use one myself in similar circumstances. I have an iPad, but although it's extremely useful, and travels with me wherever I go, it isn't suited to a life that involves working with Microsoft Office.
That's where my Netbook comes into its own. It runs Windows 7 and Microsoft Office 2010 with ease. It has a lovely display, and of course a keyboard. It's small enough to carry in one hand, but it packs enough power to handle the work.
Tablets may stand centre stage at the moment, but for the use you describe a netbook is hard to beat.
Mine is an Acer Aspire One 522.