Depends which V Star you're talking about. The 1300 is liquid cooled, while the Road Star is air cooled. Next biggest difference that comes to mind for me is that the cruising RPMs of the Road Star are SIGNIFICANTLY lower than the V Stars.
My 1600 just rumbles and bumbles happily along at 70 mph. It makes me imagine a big 'ole grizzly bear, poking around looking for something to snack on. Always having some enormous power on reserve, available at a moment's notice. The V Star's higher RPMs make them seem like they're in a hurry at highway speeds. Just my $0.02.
I've scraped my Roady's foot boards a number of times in the twisties, and I suspect that's less of an issue on the rest of the Star family, although some adjustment of the suspension will probably assist me in the matter. Scraping those things has this visceral, nails on chalkboard feeling for me. It makes me cringe even when I know it's about to happen.
The better question to be asking, is probably what kind of riding you're planning on doing. Your current bike is definitely more similar to the V Stars than the Road Star. I bought one because I WANTED the differences I could expect from the Roadie. YMMV.
Ben C - Cary, NC
2001 XV1600A Road Star
2003 XVS650A V Star Classic