That's already quite a nice list that you have.
If you like replay value that much then I could strongly suggest you
Adom and (if you don't mind multiplayer games)
STARS!.
Other nice strategy games, unfortunately falling in the RTS section but having way more strategy than "normal" RTSes, is Warzone 2100 (freeware) and Original War. I am particularly fond of Original war and those are RTS you can pause at any time so it's not really that bad. In both games you can build your own set of units as you wish, picking from existing parts. This affect power, speed but also cost so you can have a whole strategy based on it.
Another really great game would be Startopia.
MechCommander is another great favorite of mine. Rival with every other games as my favorite game too.
The Homeworld serie is also very nice but I've only managed to play Homeworld:Cataclysm. I can recommend this one but I don't know about the previous two.
... and there is probably many more games to recommend but I guess it's a good start.
