I sold my FZR 1000 (which I had for 10yrs) and bought a VTX 1800R a little over a year ago. The bike is simply amazing, especially for 2 up riding and touring (I don't want a Goldwing....yet.) It's got tons of torque, especially for such a heavy machine and is comfortable enough to ride 200+ miles without even thinking about getting off to stretch. The bike is really in it's element when you're just out for a laid-back 50-60mph cruise down the back farm roads, especially with a passenger. Even though the bike is enormous, I have ridden the bike enough to feel extremely comfortable about riding it in heavy traffic. (New Jersey still has circles (roundabouts) as well.)
On the other hand, I missed the sport-bike terribly and decided to pick up a leftover 954RR two weeks ago. Love that as well, but a completely different reason for taking that out when I do. My wife used to ride on the FZR all the time, but has no desire to ride on the 954 after being on the VTX. That's ok, b/c I bought the bike for me

lol.
Long story short (too late I know
You feel more intense on a sport-bike. If I want to go out for up to 100 miles or so of carving the turns, the 954 rocks.
If I plan to take a trip, take a passenger, or just want to relax and ride...the VTX is top choice.
I will never be without one of each in the stable.