Have to agree with the GB500 and the Hawk. The GB is really tons of fun, but putting a huge fairing on one would kill it. Around 1990 Suzuki made the first Bandit a 400- refered to as a baby Ducati. Ab-so-lutely gorgeous. And too fast for it's size... but not fairing material either. Yamaha Radian. If you're good at kick-starting, there's the Yamaha SR500 single. Suzuki GS500. BMW 650s are bullet proof, handle well, and are good for touring. SV650, definitely (early models like 2000 are better). Most early Yamaha 650s.
Something cruiser-like would work if you don't put much emphasis on handling. Honda made the Rebel in a 450 size that is relatively collectible now. Looks like a baby Harley, has decent power and is actually fairly comfortable (if you're not too tall). Harley 883 with bar snake. Moto Guzzi Breva runs nice and is comfortable. Older Guzzi V50. Moto Morini 3 1/2 or 5. I know- a mid-'70s Honda 400/4! They're comfortable, good looking, you can ride 'em all day, great in the turns but stable on the slab an... oh never mind Did I hit on anything?