I rather suspect that you would be disappointed in the Honda. As was mentioned, it's beautiful but gutless. Probably a great beginner's learner bike, but you'd be wanting for power right at the get go. The Vulcan 900, OTOH, is a great bike, powerwise and otherwise. And it can be easily and reasonably modded to suit you. You can make it louder, or not, give it a bit more power with a tuner and higher flow air kit, lower the rpms a bit with a 200 series rear tire or different pully, etc., etc....
Do consider buying used, especially this time of the year, as many folks are wanting to unload what they have, and it's a slow time for bike sales. And used prices are great. The price your dealer quoted for the demo bike isn't bad, but not wonderful, either. The only upside is that all the necessary maintenance will have been done to this bike, so you would get it with the assurance that it has been taken care of. Buying from a private party can be a pig in a poke experience, and it's a buyer beware situation. Just look it over thoroughly and if possible, see about having a mechanic you trust take a look at it. It might cost a few $$$, but is worth it if it lets you know not to buy that particular bike.
In the end, I recommend the Vulcan over just about any other similar sized cruiser available, and especially the Honda. At best, it's good for around town where you aren't going to be going at any speed. On the highway, IMO, it's a loser. The Vulcan is good for any duty.
"Don't sweat the small stuff---it's all small stuff"
'09 650 VStrom