How do you plan on using them? Plan to switch around between different VSTs or just use one?

The SIMPLEST way is to use Hermann Seib's SAVIHOST or VSTHOST, where you have a clickable icon on the screen that is the VSTi itself.

http://www.hermannseib.com/english/savihost.htm

Enjoy. I've used this kind of a setup exactly once. I didn't really like the idea of depending on a computer on stage, though I know that it's very common.