I really like the early XS650's, those are a great suggestion. A friend has a '71, almost completely original. I've ridden it once, it is an enjoyable bike. Stock exhaust sounds excellent, really torquey, etc.
I have a '74 CB550 four, it was my first bike so I'm keeping it for sentimental reasons. It's smooth, easy to ride, and fun. Problem is it doesn't have much character, it looks vintage but my Road King feels like more of a vintage motorcycle than the Honda!