More in the absolutely wonderful when finished category but still a looker, very powerful bike was the 750 waterbus, massive machine for a two stroke too.
http://www.trademe.co.nz/a.aspx?id=497051229
That's a nice "Water Bottle" as we referred to them in Oz mate, I had two, an "L" model (later one with detuned engine and CV carbs etc) and a "J" model like that one, but not as nice. The one I really want is the "K" model, which looks like that one but had twin front discs. (the 4LS brake on the "J" looks nice, but is crap compared to twin discs)
Water Bottles (or "Water Buffalo's" for the US, "Kettles" for the UK etc) were good torquey 2 stroke triples, they made a lovely sound and puffed a lovely shade of blue smoke. (and lots of it if the crank seals failed and the engine sucked in and combusted the gearbox oil, which is common) They weren't particularly fast, (they were about as fast as a CB750) but they were heavier than a CB750, they occasionally ate spark plugs and they were exteremely heavy on fuel.
GT750's were a lot more civilised that Kawasaki's H2 750 triple, and were popular with the long distance touring set. I rode one from Melbourne to Bairnsdale (180 miles point to point) in 2.5 hours in 1979, only to discover that I'd left the rear axle nut loose when I adjusted the chain and the only thing holding the wheel in line were the chain adjusters! Oh well, that which doesn't kill you makes you smarter........