hello everyone, i woould like some help on some bikes a litle before my time. hope this doesnt make anyone feel to old in here,

. I currently ride a '77 cb550. I feel comfortable on it. feels like its the right weight and size. I've ridden other bikes but this is the first bike that i own. i have been riding it for a while and am ready to move on. I would like to get a verticle twin late '60-70's. I would like to hear some ideas on the various models out there. off the top of my head i can think of:
cb350/450
rd350/400
xs650
t500
i dont mention the british twins because they are a litle out of my low budget,
In my perfect little world, my dream bike would be the vintage verticle twin cafe look and the modern sportbike performance. i like the look and feel of my current bike but i would like some more performance, in the form of a verticle twin if possible. Thanks for any help