I'd keep the '07 since with that many miles will practically be worthless, and sell the '08. I can't think of any other bike that would be SO much better (for your purposes) that it would be worth putting money toward. So, I'd just look at bikes that were totally different than the V, to fill a different niche than the bike you've already got.
I was kind of in the same position as you. I got the itch to buy a new bike when I inherited enough money I could buy any bike I wanted. But the Versys that I had just bought, did everything I wanted/needed, so I just bought a bike I always thought would be cool to own (ever since 1986 when Cycle World hopped one up), a Harley Sportster.