If you're looking for a bike that you can ride long & hard on, the Kingpin is it.
I also have a Speedmaster & love it for what it is: a mid-size cruiser. But the Kingpin is flat out better in every way. Gobs of power, great handling, comfortable and very well made. If we're going on any kind of a 2-up ride, it'll be on the Kingpin.
I test rode the 8-Ball first, then the Vegas and then got the KP because it's made to be a touring cruiser.
The 8-Ball is a steal at that price. Very tempting, but not a tourer.
The Vegas is a smoking cruiser, but also not a tourer.
If you're 5'7", the pegs on the Victory bikes might be a stretch for you, but the Kingpin has floorboards which are VERY comfortable.
FYI, I rode a Rocket and hated it. Everyone likes something different.
Victory dealers are very willing to give test rides. If you shop around, you might even luck out and find a great deal on a leftover 2006, 2007 or demo bike.
If you're looking for more feedback from Victory owners, try the Victory forums at
www.thevmc.com or
www.kingpincruisers.net
Good luck!