Personally I'd just get something nice. You will be more encouraged to ride that way. For me that would be a sporty road bike, unless I was actually ready to tour. I know some folks are happy doing all their riding on a touring bike, but riding a fast/light bike is a real joy IMO.

That said pretty much any bike that fits would suffice for what you propose doing initially.

One other thing... Liking to ride and liking to tour are two different things. You may really like riding around town and not care for weeks or months on the road or vice versa. I know that I in the last two years I didn't ride very much when not on tour, preferring to trail run. Still I love life on the road for a few weeks or months a year. Last year the bulk of my riding was a Spring tour. This year it will probably be my Summer tour on the Sierra Cascades route.