Wow, great response all, I appreciate it. There seems to be a good consensus on the 35mm, although both the 90mm and the kit lenses have their fans. I've got a couple of weeks so I'm going to play with them all indoors and annoy the family. Although I've been getting into primes recently my favourite lens is my Pentax 35-70 but the innards are starting to get dirty and it doesn't come out to play now.
I did have a look on Flickr for "Comic Con K-r" photos and did find one member using a K-r. It looks like they used either a wide lens or the kit lens as most of the shots were taken at 18mm. I'm going to have to put my brain in gear and decide just how much I want to carry around. One final bit for now, I do have a couple of manual flashes and the Sigma EF610 DG Super P-TTL flash, although I've been reading recently that the TTL isn't very good.
Scotty, If I ever sell my house I might be able to afford those lenses you recommend.
Thanks again all
Ray