Okay so I'll put this forward for folks input as a swap out. The chassis and quirks they come with.
Orion- AA targeting, Easy to Maintain, Rugged.
Pro: Keeps the AA Targeting that I have on the Rifleman right now.
Lose: Improved Communications, likely negligible now, but could have use in a large scale engagement later on; Search Light for night combat; and ubiquitous (easier to find replacement parts.
Black Knight: Pro, Command Mech for +1 intiative once it is 'fixed'. Con: It's starts the campaign broken.
Flashman: Pro, It's a Flashman, Rugged, and it's a Flashman.
Ostsol: Pro Improved Sensors (Beagle Probe), Narrow/Low Profile, somewhat useful damage reduction. Con, losing out on the quirks of the Rifleman or Orion.
I'm thinking at the moment in this order Orion, Ostsol, Flashman, Black Knight. I can make an Orion that is configured close to a Flashman or Black Knight. The perks on the other hand for the Ostsol aren't half bad.