I'd go for a 750, 620, a 695. All or relatively 'modern' with fuel injection, it's going to be a bit cleaner running without much maintenance though the carbs work perfectly well. You aren't planning to be out on the bike when it gets frosty so icing isn't going to be a problem so you could go for a carbed 600 or 750. Given the choice of these the 750 is the peach to go for.
Over 6 foot most anything is going to look small but it'll fit, you might feel more comfy with the bars hiked up with risers but that's all pretty stock stuff and not at all difficult to do.
There are also a few 800's around in the standard 'monster' styling and the S2R which is the same motor but with a single side swinging arm and exhausts stacked on one side.
Get looking, get out and try one if you can but get one
