Hey rickon, nice bike your mulling over there;-) thought you were a bit quiet. Don’t worry about standover, vortex at about 5ft nowt can stand clear of top tube. It sounds like you right on the line for top tube length and it may well come down to riding style.
In some respects the good standover means for playing you can fit short stem and drop the seat but then for longer xc rides a slightly longer stem will give you the option to stretch out a little more. I went for a 70mm as an allround compromise. you could go with a nice 60mm turbine as a compromise.
As I say your welcome to swing a leg over it if your in the area.out