[Closed] What size cross frame?

I know this has been asked a million times. The common theory is to go 1 size down from your road frame but [url= http://mattmagee.blogspot.co.uk/2010/09/how-to-fit-cyclocross-bike.html ]reading some things on the internet[/url] this isn't always best

My road frame is a 56 with a traditional flat (geometry wise) top tube. which is 54 centre to centre. I also run a nice long 120m stem. People comment i always seem to have a high seat (18cm seatpost showing to rails)

I'm 5'9 with a 32" inseam

been looking at the forme hiver or empella bonfire*

* Which says for my leg and height should be a 56