Funny, I've been a long term Zenwalk user, started looking seriously at Vector a few months ago. I also just encountered someone else who is using both Vector and Zenwalk (though I think he started with Vector, then tried Zenwalk).
For two distributions that come from a common base and share similar design goals, its amazing just how different Vector and Zenwalk are. Its almost annoying. There are things I prefer about Zenwalk, and also areas where Vector suits me better.
When I finally finish building my shiny new Core2Duo machine, I guess I'll have to install the 64-bit version of Vector - currently Zenwalk has no 64-bit variant.
Hope you enjoy SOHO.