If you want a DCS type of MechWarrior game, then I suppose the closest you'll get is Battletech 4.x on one of those Virtual World Tesla pods. You have to manage generators and coolant loops using the MFDs, something you never have to worry about even in the PC MechWarrior titles!
Affording such a setup-and maintaining it-is another story, though...
Other than that, I'm not really sure what to recommend you. Most mech "sims" don't really play all that alike in my experience, as they all have their own nuances. Just try comparing the PC MechWarrior titles, Heavy Gear 2, and Steel Battalion (the original Xbox titles with the huge controller) in terms of gameplay, and you'll find some very noticeable differences in their renditions of mech combat.
And for the most part, subsystem management (like a DCS-grade combat flight sim) isn't really part of the picture. Loadout customization, on the other hand...