Well, I know that since you are using the mod manager, I don't really need two installations. But I have:
DW 1.04
DW 1.04 + LWAMI 3.08
I suspect all I need is LWAMI 3.08, since unlike SCX I think it only enhances the game as breaks missions which were designed for the stock game.
I also have installed:
SC 1.08 (stock game)
SC + SCXIIc + SCU
For SC, there is a large collection of pre-SCX scenarios to play and post-SCX scenarios.
However, disk is pretty cheap these days. So, I don't worry about this much.
Remember when disk when expensive? I used to use DoubleSpace and Stacker so that I can cram more games on my already extra large 650Mb SCSI hard drive!