I prefer the Nuke subs, and 688i, SC with SCX, and DW, but I would buy SH4 but having to buy a new processor and video card puts it out of my reach at the moment.
I have read up on it and it certainly sounds like a great Sim, but I am unable to bear the cost of being able to play it.
Ron Banks MMCM(SS), USN(Ret)