re: New Horizons is a bad name for the spacecraft.
I will ditto your statements. I too thought the probe should have been named Tombaugh, as well as having an information package similar to the Voyager Records. But it is heartening to know that a part of Pluto's discoverer is going to become the first human being to leave the Sol system, in a sense.
I found this interesting article from last May by Alan Stern explaining how he came up with the probe's final name of New Horizons:
http://www.thespacereview.com/article/369/1
Voyager 3 had actually been considered as a name, but Voyager was a JPL project. They better start naming some other deep space probes Voyager 3 and so on, otherwise we won't have V'Ger to deal with in 300 years!
http://en.wikipedia.org/wiki/V'ger