My husband recommends the HD 883 Sportster standard height with the larger tank and touring seat. He says the performance isn't much different from the 1200 but has better gas mileage. The low cuts your lean angle so won't handle as well in twisties. He says this is probably closest you'll come to the performance of the Vulcan. (He rides a Kawasaki Versys)
My two cents worth:
I just bought a HD XL1200L Monday, because my VN 750 is on vacation for a while
(stator). I have only put about 400 miles on it, but like the ride so far. It came with a larger tank, windshield, and touring seat. It's getting just over 50 MPG so far. I haven't really pushed it in twisties yet, but will get the chance to do so on the Pig Trail Byway tomorrow. (Last week on the same road, I drug parts on my Vulcan.)
I have a VStar 650- terrible in twisties- too low.
I test rode the VStar 950- drug parts turning at a red light twice during the test run. It is scary low.
I also test rode the Vulcan 900 Custom and Classic. I liked them both, but since I am vertically challenged had a bit of a problem reaching the pegs. They are also pretty low to the ground and might not do so well in the twisties. (The pegs on my Sportster are mid-set, not forward set. It rides more like a standard than a cruiser.)
Sorry so long winded- hope this helps.