Since it's your first DSLR, i'd go with the kit lense from there you can then decide on your future lenses; wider or longer, the 18-55II is a pretty good daily walk around lense that will handle most if not all of your shooting needs (i sound like an Ad here)
it may not be the fastest but you have SR in body so you have a ~+5 stop buffer right there, the contrast/resolution may not be premium but can most people tell if shot properly?
Here's a few sample shots off Flickr
http://www.flickr.com/search/?q=Pentax+18-55II&m=tags