Funny you should mention..Got this last month just before my trip...came with an 18-55 and 55-300....did a Lot of research and felt Pentax gave me more for the money then the others...and I like the fact it says Pentax on it...it feels more old school to me..like revolvers I guess...
Pentax K-r Review: 1. Introduction: Digital Photography Review
Btw, I like that 18-135 on your k5....very versatile....I'm not much into switching out lenses...ive been using the 18-55 for indoors...for outdoor stuff with the kids, my 55-300 has been living on it....best way to get good shots of kids is from a distance....especially if they aren't your kids.