I'm trying to figure out the best DOS configuration for emulation and maybe real hardware, too. Right now, I am considering IBM DOS 5.02 upgraded to PC DOS 7 Rev. 1 (2000). You get an IBM branded DOS-Editor, but still all the nice tools from the future, like DELTREE.EXE, DEFRAG, PC DOS-Shell 7.0 or Windows Undelete. Seems to be the best overall DOS package...
Any other ideas / suggestions?