Yeah I like the Karate Monkey but it is expensive. If I could find a used frame set and build it myself I might be able to get it around $500 bucks.
I need to be on the lookout for a used one for sure. I love that Surly makes their bikes with both a performance/utility mindset.
The Monocog is also interesting. Redline seems to make many varieties of it and I have heard good things.