Mist Lynx all the way. It's light, fits the weight class of a heavy Lance for the whole star, is a jumpy mech that can keep the Shadow Cat company. And, 7/11/6 is relatively fast for those good move mods.
Barring that, the Vulture is a solid heavy for the Smoked Jaguars (I'll never call it a Mad Dog, there's already too much Clan Wolf favoritism in naming the mechs as it stands).
And the Stormcrow is also a reliable medium mech that can do everything the Vulture can.
One more Heavy mech I find useful is the Summoner (Thor). It Jumps, has a wide variety of weapon choices and the Nova Cats like it too.
GC