Good first motorcycle?

I'm looking to get my first motorcycle. I took and passed the MSF course, riding the Suzuki TU250X. Before the class, I had never sat on a motorcycle, so almost no experience. I'm looking for 70's/80's UJM. I like the look of the Honda Nighthawks or the Suzuki CB's, but I'm open to whatever. I'm 6' 3" 235lbs 36" inseam so I want something I can comfortably ride and not look like a bear on a unicycle. Obviously, I want decent reliability (although I realize anything that old will have problems), but I have no problem adjusting valves, cleaning carbs, etc. It would be a commuter first and a toy on weekends. I live in the middle of nowhere, so my commute in 1/2 hour on empty highways. What makes/models would be best in your opinion? What engine size? Anything to avoid?
Added (1). I'm not dead set against cruisers, but I prefer a sportier look.
Added (2). Suzuki GS not CB

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