This is why I love my Langster and have posted about it, oh, 50 times or so now. It has approximately the same standover height as my 50cm Surly even though my Langster's geometry converted to "conventional" instead of compact would give it a 54.8cm size. The Surly feels like the bars are directly in front of my knees, basically. The Langster fits me better and lets me stand over the thing without crushing my knutz because of the sloping top tube. Perfect.

Now I know the Pista Concept has conventional geometry but all I'm getting at is that the seat tube length is only the beginning of what you need to consider when picking a frame. It's a number that could be meaningless for you.