Cyclocross Bikes - SS / Fixed

Are there any CX frames that stand out as being particularly roomy in the tyre department? I know that the Surly Cross Check goes up to 700 x 45 still with mudguard clearance, is that about the limit?

Any more than that and your defo in 29er territory.
Not many v-brake models around these days though.
Just chuck some drops on a karate monkey.
http://www.tredz.co.uk/.Surly-Karate-Monkey-29er-MTB-Frame_31717.htm