No. You look exactly at the right thing. It does not get more hardcore and professional on a PC than with SBP. Military customers do not pay withoiut reason those 18 thousand dollars per 10-machine license.
There is a new WWII tank sim coming, though. One need to wait in order to learn if it can match SBP or not. The difference between training tool and game probably will be needed to be taken literally.
Check these:
http://www.subsim.com/radioroom/showthread.php?t=88970
http://www.subsim.com/radioroom/showthread.php?t=88893
http://www.subsim.com/radioroom/showthread.php?t=97188